Answer:
1. RNA
2. Transcription
Explanation:
DNA stores the instructions required for the synthesis of proteins. However, the sequence of DNA does not directly serve as a template for protein synthesis. Rather, the template DNA strand is copied into the RNA. The process is called transcription.
The RNA in eukaryotes undergo modifications such as removal of introns and the addition of specific sequences at its 3' and 5' end. This mature mRNA that joins ribosomes for protein synthesis. The nucleotide sequence of mRNA is read in the form of triplets and each triplet code for a specific amino acid.
are mutations in dna advantageous or disadvantageous
Answer: Both
Explanation: it is advantageous in a way that it increases the chances for organism to be adjusted in the environment such as survival chance is increased sometimes by positive mutations. Sometimes replacing the wrong gene with right gene by the mutation is advantageous.
Sometimes, mutations in DNA doesn't have any effect, means it has neutral effects.
It is disadvantageous sometimes that it results in the occurrence of disease which may be serious disease like heart disease. Tiny mutations also results in disorders.
The first stage of neural communication, _____, refers to the movement of the signal within a single neuron, while _____ refers to the movement of a signal between neurons.
Answer:
Conduction
Transmission
Explanation:
Neuronal Conduction is the first stage of neural communication in which communication occurs through electrochemical channels. Electrical signals produced via chemical molecules are passed to the cell body via the dendrites and through synapses, bracing and invigorating the neuron to generate their own stimuli as it is being relayed down to the axon terminal of a neuron. The neurons in the electrochemical channels helps to coordinate and monitor the flow of these electrical charges through the membrane mediated channel in order to conduct nerve impulses.
Neuronal transmission talks about the transference of signals or stimuli via the neurotransmitters(signaling molecules). They are relayed down by the axon terminal of a neuron as earlier stated above. At the terminal end, they coupled at receptors site with other dendrites of another neurons to transfer the signal across.
Describe the components that should be included in a well-written scientific abstract and what should be excluded.
PLEASE HELP NEED ANSWER ASAP.
Answer:
The components of abstracts that should be included are as follows: " introduction, Description, limitations, conclusion". Other than these components anything else should be excluded.
Explanation:
The various components of an scientific abstract that should be included are as follows:
Introduction: In this part of the abstract it should contain the brief idea about the research.
Description: In the second part it should contain the research and the objective of the research and also about the analytical methodologies that has been applied in the research.
Critical: This is part in which the limitation for the research are present.
Language: The most important factor, the language used should be very formal type.
Conclusion: The things and ideas that had been learnt during the period of research. It should also contain the new findings and the trends that has came out during the research.
Imagine you genetically engineered a neuron to produce voltage-gated Na" and K channels that opened at the same time in response to a change in voltage. How would that change the recording shown in the figure? eacitation 1 4 Resting potential A) Threshold values would increase B) The peak voltage would be higher. C) The peak would occur over a longer period of time. D) The period of hyperpolarization would be longer. E) No action potential would be generated.
Answer:
E) No action potential would be generated.
Explanation:
As we know the voltage gated Na and K channels has specific roles in the generation of action potential. When both the channels are opened at the same time sodium will move inside and potassium will move outside no action potential would be generated.
At the peak of action potential , area of the neuron is about 40 mV positive. Now when the voltage becomes positive , sodium channels close and the potassium channels open.
When the potassium channels open , they cause the potassium ions to rush out of the cell thus causing the voltage to become negative again.
Hence E) No action potential would be generated is the right answer.
Untreated diabetes mellitus can lead to a condition in which the blood is more acidic. True or False
Answer:
TRUE as diabetic ketoacidosis
Explanation:
It is more common in individual with diabetes type 1, because they do not produce insulin than type 2 who produce Insulin.
The elevated acid is due to untreated diabetes, excess glucose is wasted in urine(polyuria), and dehydration sets in,because no insulin to facilitate glucose entry into cells through GLUT transporters. Elevated glucagon(in absence of Insulin) facilitated the breakdown of glycogen by the liver to glucose which is further excreted in the urine ( Glycogenlysis)
Therefore the body is depleted of glucose.To make up for this the body withdrawal free fatty acids from adipose tissues and break it down to glucose,(beta oxidation) in the liver(the process is called GLUCONEOGENESIS formation of glucose from non carbohydrate molecules).
The above produces KETONES in the body. Ketones has a very low pH;therefore building up of KETONES in the blood leads to KETOACIDOSIS.
The two strands in a DNA helix are described as being antiparallel, or in opposite orientations. If one DNA strand is in the 5' to 3' orientation, the complementary DNA strand is orientated in which direction?
Answer: The answer is 3' - 5' direction
Explanation:
Since the template strand runs in 5' - 3' direction, antiparallel nature of the DNA double helix explains that the complimentary strand (non-template strand) runs in a 3' - 5' direction
Answer:3' to 5'
Explanation:DNA consist of two strands that runs anti-parallel. the first called the leading strand and its runs from 5' to 3' orientation meaning it runs from carbon 5 to carbon 3 while the second strand is called the lagging strand or the ozazaki fragment it runs from 3' to 5' i.e from carbon 3 to carbon 5.
The two strands cannot be replicated in a row hence the need for the break into the leading that replicates towards the replication fork and lagging strand replicates towards the opposite direction.
A biologist is studying two organisms, X and Y. She knows that at least one of them is an animal. Organism X only reproduces sexually. Organism Y reproduces both sexually and asexually.
Which conclusion is best supported by the information?
a. Organism X is an animal, and organism Y is not.
b. Organism Y has the benefit of not having to find a mate.
c. Organism X has offspring that are not genetically diverse.
d. Organism Y is a heterotroph, and organism X is not.
Answer: option B) Organism Y has the benefit of not having to find a mate.
Explanation:
Unlike organism X, Organism Y is capable of reproducing it's young ones by undergoing meiosis or in the presence of a mate supply gametes that will then be fused together into a new offspring as characterized in sexual reproduction; AND ALSO in the absence of a mate undergoes mitosis, binary fission etc as characterized in asexual reproduction.
Answer:
B. Organism Y has the benefit of not having to find a mate.
Explanation:
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Which of the following planets has iron oxide in its crust?
Mars
Mercury
Neptune
Venus
Answer:
Mars
Explanation:
These huge canyons were most likely formed by the planet's crust splitting. Mars is also famous for its red color, which is iron oxide (rust) dust that covers the surface of the entire planet.
This iron oxide is primarily responsible for the planet's distinctive reddish color. The planet that has iron oxide in its crust is Mars.
Mars is often referred to as the "Red Planet" due to the presence of iron oxide on its surface, which gives it a reddish appearance.
Iron oxide is a compound made up of iron and oxygen. On Mars, iron-rich minerals in the crust undergo weathering and oxidation processes, causing the iron to combine with oxygen and form iron oxide.
The specific type of iron oxide responsible for Mars' reddish color is called hematite, which is commonly found on the planet's surface.
The reddish hue of Mars is particularly pronounced in certain regions, such as the planet's vast deserts and plains.
These areas contain a high concentration of iron oxide, giving them a distinct rusty appearance.
Thus, the correct option is "Mars".
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What pigment molecule absorbs blue and red light to provide energy for photosynthesis
Answer:
chlorophyll a
Explanation:
This is the pigment s that absorbs light in blue and red light wavelengths when illuminated by sunlight with all wavelength.However it reflects green light. This explains the reason why green plants appears green to our eyes,
the pigments are located in leave and stem of green plant.
Blue light has a wave length of 430nm, while Red wave length is 662nm
The fact that protein-based hormones are hydrophilic means that they:___________
a. are lipid-soluble.
b. do not cause conformational changes.
c. can diffuse across the membrane.
d. have to bind to receptors to cross the membrane.
Answer: The answer is that have to bind to receptors to cross the membrane.
Explanation:
A hydrophilic substance can easily dissolve or absorbed in a water containing vessel, not a fat or lipid vessel like biological membranes.
Now, protein-based hormones like dopamine or serotonin ARE NOT LIPID-SOLUBLE; so, have to bind to receptors positioned in the membrane and MAY also require energy in form of ATP for across the membrane before they would exert their function on the target cell or organelles.
Which pair of organisms, if found together in the same well-defined fossil layer, would cause a major rethinking of our current understanding of the fossil record?
A client who has undergone a colostomy several days ago is reluctant to leave the hospital and has not yet looked at the ostomy site. Which measures will most likely promote coping?
The question is incomplete. The complete question is as follows:
A client who has undergone a colostomy several days ago is reluctant to leave the hospital and has not yet looked at the ostomy site. Which measures are most likely to promote coping? Select all that apply.
a.Remind the client frequently that he will be responsible for caring for the colostomy at home
b.Ask a member of the local ostomy club to visit with the client before discharge
c.Ask the enterostomal nurse specialist to consult with the client before discharge
d.Remind the client frequently that infection is a major complication of a colostomy
e.Ask the client to begin doing one part of the ostomy care and increase tasks daily
Answer:
Colostomy may be defined as the surgical procedure in which the large whole is created in the large intestine. This provides the alternative means to throw feces out of the body.
The medical assistant must cope positively with the patient. The attendant must visit the client before the discharge of the patient. The proper medicine and prevention from infection must be instructed to the patient. The enterostomal nurse must visit the patient.
Answer:
Call for the ostomy nurse to teach them how to change their appliance, and let them see their new stoma. Set them up with an appointment with an ostomy nurse that soon, so they can get scripts for supplies, and resolve any post-op ostomy product or leakage problems later on, since the products they are given inpatient may not be the right one for them once the swelling goes down. Let the nurse explain things, they may step out to gather supplies that are more appropriate for the patient to take home. Once the nurse is done educating, the patient will be ready for discharge.
Mary Morgan has just been brought into the emergency room of City General Hospital. She is perspiring profusely and is breathing rapidly and irregularly. Her breath smells like acetone (sweet and fruity), and her blood glucose tests out at 650 mg/100 ml of blood. She is in acidosis. Which hormone drug should be administered, and why?
Answer:
The insulin must be administered.
Explanation:
In the given question the Mary has the acidosis that is the level of pH in the blood have dropped below 7.
It is also provided that the smell of her breath is fruity due to the accumulation of fruity smell molecules called ketones which could be the result of the ketosis. Ketosis occurs when the cellular respiration uses fat as a substrate instead of the carbohydrate. This shows Mary has a condition called ketoacidosis.
The increased level of the glucose in the blood shows that the glucose is not absorbed by the cell which involves the insulin therefore the doctor should administer the insulin drug to the patient.
Thus, insulin is the correct answer.
Administer insulin to address high blood glucose levels and symptoms of ketoacidosis.
In the case of Mary Morgan's symptoms, with a blood glucose level of 650 mg/100 ml and signs of ketoacidosis, administering insulin is crucial. Insulin helps lower blood sugar levels by promoting the uptake of glucose into cells, which can help correct the ketoacidosis and its associated symptoms.
People that have a single allele (gene copy) for sickle cell anemia are typically not sick from the disease and are said to be carriers of sickle cell trait. These people will more often live in the malaria belt of sub-Saharan Africa. The most likely explanation for this is ________.A. malaria is a cause of sickle cell trait
B. the tropical climate attracts people with sickle cell trait
C. sickle cell trait is passed on to the biting mosquitoes as malaria
D. people with sickle cell trait have a better chance of surviving malaria
A scientist conducted an investigation about the effects of diet on disease resistance in rats and made surprising observations. The mice with a genetic ear mutation seemed to show similar patterns of resistance compared to mice with normal ears.
Based on this information, what will most likely occur?a. She will perform a second investigation on the role of certain genes in disease resistance.b. She will revise her hypothesis to pertain to mutations rather than diet, and update her data accordingly.c. She will use this information to determine that her original question was nonscientific, so she will revise it.d. She will determine that her hypothesis was invalid because resistance must be genetic.
Answer:
B
Explanation:
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\Archaea and bacteria * 3 points have mitochondria and chloroplasts have similar cell structures have similar genetics and biochemical composition square
Answer:
have similar cell structures
Explanation:
Archaea and bacteria are single-cell organisms that are classified as prokaryotes. They both possess similar cell structures as they tend to both have the same shape and size when viewed with a microscope. They both do not have a nucleus or other membrane-bound organelles like mitochondria and chloroplasts. One of the structures they share in common is the thread-like structure called flagella, which they use as in navigation around their environment.
Irrespective of the fact that they have similar cell structure, advanced studies have shown that archaea and bacteria have different genetic coding made of different proteins. Both cells also differ in the composition of their cell walls.
John Needham performed an experiment testing spontaneous generation. He boiled chicken broth, placed it in a sterile flask, and then sealed the flask. After a few days, Needham observed microorganisms in the flask. Based on current understanding, how was his experiment flawed?
A. Boiling activated dormant microorganisms present in the broth.
B. Boiling the broth did not kill all microorganisms present.
C. Microorganisms entered the broth from the flask itself after the flask was sealed.
D. After Needham boiled the broth, microorganisms entered from the air.
Answer:
D
Explanation:
John Needham may not have aseptically transferred the broth after it was boiled which might have allow air to enter after the broth was boiled. The experiment has been repeated with control that were not boil; the broth was sealed in the flask and properly boiled; no grow was noticed in the broth plus flask that was boiled properly and sealed while the control which was not sealed ( exposed to air) had growth suggesting that the microorganism or their spore in the air was responsible for the growth.
John Needham's experiment was flawed because he did not boil the broth long enough to kill all the microorganisms, which led to their growth and the mistaken inference of spontaneous generation. So the correct option is B.
Explanation:John Needham's experiment was flawed because boiling the broth did not kill all the microorganisms present. Based on current scientific understanding, Needham likely did not boil his chicken broth long enough to eradicate all the microscopic life forms it contained. Subsequently, these surviving organisms multiplied, leading to the clouding of the broth that Needham observed. This mistake led him to mistakenly support the hypothesis of spontaneous generation, the idea that life could emerge from non-living matter automatically.
Other scientists, such as Lazzaro Spallanzani and Louis Pasteur, would later design more rigorous experiments that avoided such flaws. Spallanzani's experiments involved extended boiling, which contradicted Needham's findings by showing that microbes did not appear if the flasks remained sealed after boiling. Pasteur improved upon this with his swan-neck flask experiment, definitively proving that the microorganisms came from the air, and not from a hypothetical 'life force', thus discrediting the theory of spontaneous generation and supporting the concept that 'life only comes from life'.
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The iliacus and the psoas major muscles are collectively known as the ____________ muscle because they share a common insertion on the __________ of the femur. A- iliopsoas; lesser trochanter B- iliopsoas; greater trochanter C- psoasiliacus; greater trochanter D- psoasiliacus; lesser trochanter
Answer:
The correct option is A- iliopsoas; lesser trochanter.
Explanation:
The Iliopsoas muscle is formed by the iliacus muscle and the psoas muscle. The Psoas is located in the abdominal cavity, behind the internal organs and in front of the pubic bone, it is subdivided into psoas major and psoas minor. It originates in the last dorsal vertebra and all lumbar. The Iliacus is a flat and triangular muscle that originates from the inner surface of the sacrum and ilium bone. Both are inserted through a common tendon in the proximal femur. The direction of its fibers is down with a posterior and external twist to reach the femur in its lesser trochanter.
The iliacus and psoas major muscles are collectively known as the iliopsoas muscle, and they share a common insertion on the lesser trochanter of the femur.
Explanation:The iliacus and psoas major muscles are collectively known as the iliopsoas muscle. These two muscles share a common insertion on the lesser trochanter of the femur. So, the correct choice is A- iliopsoas; lesser trochanter.
The psoas major muscle originates from the lower back, while the iliacus arises from the ilium of the hip bone. Both muscles converge in the pelvic region and insert together into the lesser trochanter of the femur. This shared insertion point allows them to work together to provide flexion in the hip joint.
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The nurse reviews the medication history of a postoperative patient, which shows carbidopa-levodopa with selegiline, along with meperidine for pain, with instructions to begin taking entacapone with each dose of carbidopa-levodopa after 10 days. What is the appropriate nursing action?
1
Hold the meperidine and call the health care provider.
2
Administer all medications and monitor blood pressure hourly.
3
Administer the meperidine as ordered and hold the entacapone.
4
Administer the meperidine as ordered and hold the carbidopa-levodopa through the postoperative period.
Answer:
Hold the meperidine and call the health care provider.
Explanation:
Parkinson's disease may be defined as the medical condition in which the movement of the individual gets affected. This is a progressive disorder that might also causes stiffness.
Carbidopa-levodopa and selegiline medication is given to the patient suffering from Parkinson's disease. Selegiline and meperidine can be given together as it may cause disorientation in the patient. The nurse will give meperidine for the proper treatment of the patient. The nurse calls the health care provider to provide emergency and extra medical care to the patient.
Thus, the correct answer is option (1).
While a relatively inefficient mode of transmission, _____________ accounts for 90% of HIV infections worldwide.
Answer:
The correct answer is - sexual transmission.
Explanation:
HIV infections can be transmitted by the various mode. Sexual transmission is one of the major mode of transmission which is comprise almost 90 % of HIV infection, according to the reports. These are relatively inefficient mode, unprotected or unnatural sex is the major mode for the HIV transmission worldwide. Cases are now comparatively less than when it was discovered due to awareness.
Thus, the correct answer is - sexual transmission.
The skin is the body's largest organ. It's made up of many different types of cells. Oils, produced by the sebaceous glands, prevent the skin from drying and splitting. The protein melanin, produced by melanocytes in the epidermis, protects the skin from the harmful effects of ultraviolet radiation. Sweat, released through ducts to the skin surface, helps to cool the body. The types of cells that produce these compounds have different numbers of specific organelles, depending on their function.The oil from the sebaceous glands is produced by which of the following cell organelles?
a) ribosomes
b) brough endoplasmic reticulum
c) cell membrane
d) smooth endoplasmic reticulum
e) central vacuole
Answer:
d) smooth endoplasmic reticulum
Explanation:
Smooth endoplasmic reticulum which is located inside the cytoplasm of an eukaryotic cell is composed of a disklike structure. It role is to integrate lipid production, synthesis of sex hormones e.g steriod hormones. They also produces the oil from the sebaceous glands that are release via the Hair follicles. The main purpose of the oil produced is to put a stop to hair from drying out.
ATP molecules, which are used for energy by cells, are built during all three stages of cellular respiration.Which stage of cellular respiration generates the most ATP molecules
The Electron transport chain of the cellular respiration generates the most ATP molecules.
Explanation:
The cellular respiration takes place in three phases: glycolysis, Kreb's cycle and Electron transport.
In glycolysis net gain of 2 ATP occurs, Kreb cycle 2 GTPs, ETC 32 ATPs
In Kreb's cycle 2 GTP, 6 NADH, two FADH2 is formed. These are used in the electron transport chain to produce ATP by redox and oxidation reactions.
Each NADH produces 3 ATPs
each FADH2 produces 2 ATP
GTP=ATP
An adaptation is a structure or function that is common in a population because it enhances the ability to survive and reproduce in a particular environment. Provide one example and an explanation of one adaptation in the Anolis lizards.
Answer:
The legs of the lizard
Explanation:
Some Anolis species have different sizes of legs according to what part of the tree they inhabit and forage. An ancestral Anolis lizard species might have gave rise of different species nowadays. Anolis species that lives on twigs have shorter legs than the Anolis lizards that live on the trunk of a tree. This observation is explained by adaptive radiation, which lead to lizards with long and short legs to survive specially in the trunk and twigs, respectively. The lizards with long legs could survive and reproduce more than short legs lizards in the trunks of trees, therefore a population of long legs gained more individuals throughout generations and became more predominant on those areas.
An adaptation in Anolis lizards is their varying limb lengths, with some species having longer legs for ground movement and others having shorter limbs for navigating narrow branches, which aids in survival and reproduction.
Explanation:An adaptation is a heritable trait that improves an organism's ability to survive and reproduce in a specific environment. One example of an adaptation in the Anolis lizards is their different limb lengths, which correlate with the habitat they occupy. For instance, some species have evolved longer legs to facilitate better movement on the ground, whereas others have shorter limbs that are advantageous for navigating narrow branches.
This limb variation is directly related to the Anolis lizards' ability to exploit different ecological niches and avoid competition. Lizards with longer legs can run faster on open ground to escape predators and cover more territory, enhancing their survival and reproductive success. In contrast, those with shorter legs have a better grip and can move more agilely among twigs and leaves, which also increases their chances of survival and reproduction in their respective habitats.
A resident of a long-term care facility refuses to eat until the client has had hair combed and makeup applied. In this case, what client need should have priority.
Answer: They should make sure his/hers hair combed and makeup applied then given the food. As fast as possible!
Explanation: brainly pls
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The resident's need for grooming before eating should be prioritized as it addresses their psychosocial needs and self-consciousness. Meeting this need may improve their willingness to eat and overall mental well-being.
In this scenario, the primary client need should be psychosocial support. The resident's refusal to eat until they have had their hair combed and makeup applied suggests a high level of self-consciousness. People who are self-conscious often spend more time on their appearance to feel better about themselves.
To address this, the care facility should prioritize fulfilling this grooming need before mealtime. This approach respects the resident's dignity and can significantly improve their mental and emotional well-being, potentially increasing their willingness to eat and participate in other activities.
How does carbon move through biotic and abiotic sources?
Answer:
Thus, an abiotic factor (carbon dioxide) helps create a biotic factor (the plants made out of carbohydrates). Once cellular respiration starts in the organism, it releases Carbon dioxide back into the atmosphere, and the cycle repeats
Explanation:
Nutrients move through the ecosystem in biogeochemical cycles. ... The chemicals travel not only through the biotic and abiotic components of an ecosystem, but they also travel through an organism. The abiotic factors of an ecosystem include: (1) water (hydrosphere), (2) land (lithosphere), and (3) air (atmosphere).
A teratogen: a) May be a virus, a drug, a chemical, radiation, or environmental pollutants Is usually inherited from the mother b) Cannot cross the placenta during the period of the embryonic stage c) Can be counteracted by good nutrition most of the time.
Answer:
Option-A
Explanation:
A teratogen refers to a agent which can cause abnormal development of the foetus during pregnancy. A teratogen affect the growth of the foetus usually during after 10 to 14 days of conception.
A teratogen is a substance which is usually found in the environment to which the pregnant lady is exposed therefore there are four types of teratogens found: the biological agents which could cause infection, the physical agents like chemicals, metals heat and radiation and the drugs and chemicals from the environment.
Thus, Option-A is the correct answer.
teratogens found in the environment and in extraordinary circumstances can include metals, chemicals, radiation, and even heat. Examples of these teratogens can include mercury, potassium iodide, nuclear fallout radiation, and even high-temperature hot tubs!
eratogens are classified into four types: physical agents, metabolic conditions, infection, and finally, drugs and chemicals.
Six-month-old Eva dropped her teething ring in a fairly rigid way, simply letting go and watching it with interest. This example demonstrates Piaget's belief that at first, schemes are __________.
A) sensorimotor action patternsB) deliberate and creativeC) preoperational thoughtD) disorganized and random
Option A
This example demonstrates Piaget's belief that at first, schemes are sensorimotor action patterns
Explanation:
When a kid is born, he/she begins growing both bodily and cognitively. As newborns improve cognitive abilities, they begin reminiscing about their habits and responding to various provocations such as sounds, action, and tremors. This is termed as the sensorimotor stage.
During this stage, babies acquire a perception of the environment by analysis and fault managing their minds and functions. The chief growth through the sensorimotor stage is the recognition that things exist and incidents happen in the context autonomously of one's individual efforts.
All of the following are desirable qualities in a model organism EXCEPT __________.A.) long life spanB.) ease of growthC.) common genetic mechanisms with other organismsD.) production of many offspring
Answer:
Long life span
Explanation:
A model organism is a non human specie that is used for study in order to understand a particular biological phenomena.
One of the qualities of a model organism is that; It should have a short life span this will make it more amenable to experimental manipulation due to short generational time. Therefor Long life span will not be a desirable characteristic.
Other desirable characteristic includes ease of growth and production of many offsprings.
Also common genetic mechanism with other organisms, they should share some degree relatedness.
18. Which types of mutations, positive, negative or neutral, are most likely to be seen in offspring
several generations after the mutation occurred? Explain your reasoning.
19. Consider the following scenarios. State whether the mutation is likely to be passed on to the
offspring of the organism. Explain your reasoning.
a. A single bacteria cell contains a positive mutation in its DNA.
b. A skin cell on a cat contains a positive mutation in its DNA.
C. A sperm cell in a whale contains a positive mutation in its DNA.
Final answer:
Neutral mutations are most common and can become prevalent over time without necessarily affecting fitness. Positive mutations can spread if they are beneficial, while negative mutations are typically removed quickly. The type of cell (germ vs. somatic) containing the mutation determines its likelihood of being passed to offspring.
Explanation:
In terms of which types of mutations—positive, negative, or neutral—are most likely to be seen in offspring several generations after the mutation occurred, neutral mutations are most common. These mutations often have no immediate effect on the organism’s fitness and can become prevalent in a population over time through random processes like genetic drift. In contrast, negative mutations are typically removed from a population quickly because they decrease an organism's fitness. Positive mutations, while less common, can become prevalent if they confer a survival or reproductive advantage.
Regarding the scenarios where mutations can be passed to offspring:
A single bacterial cell: If it contains a positive mutation, it is likely to be passed on to the offspring because bacteria reproduce asexually and any mutations in the parent cell will be inherited by all daughter cells.A skin cell on a cat: This mutation is unlikely to be passed on to the offspring because it is a somatic mutation, which affects only the body cells and is not inherited.A sperm cell in a whale: If it contains a positive mutation, it is likely to be transmitted to the offspring because sperm cells are germ cells involved in sexual reproduction, thus carrying genetic information to the next generation.Mutations in germline cells (sperm or egg) can be inherited by offspring, influencing the genetic composition of future generations. However, somatic mutations are not passed on to offspring and do not affect the species' gene pool over time.
You want to test whether duration of light exposure affects fish reproduction. What would be your control group and experimental group?
Answer and Explanation:
During an experiment, data from an experimental group are compared with the data of a control group. These two sets are identical in all aspects except for the independent variable that the researcher changes in the experimental group to observe how they affect the individuals. This variable keeps constant in the control group.
The experimental group is the one that receives the experimental procedure, with changes in the independent variable. There can be several experimental groups.
In the control group, the variable measured keeps constant, not influencing the results. This isolates the effect of the independent variable on the experiment and helps to find alternative explanations to the different results.
In the exposed example:
Control group: Certain amounts of fishes exposed to a normal number of light hours per day. For example, if under natural conditions in its original environment the species is exposed to 12 hour light, then the control group should be exposed constantly to 12 hours light a day to maintain its normal reproductive levels.Experimental group: Certain amounts of fishes, equal to the control group, exposed to a different number of light hours per day. For example, there might be 5 experimental groups: one of them exposed to 4 hours light, a second group exposed to 8 hours light, the third group exposed to 12 hours light (The same as the control group), the fourth group exposed to 16 hours light, and the fifth group exposed to 20 hours light.Except for light, the rest of the variables should be the same for all the groups.