Which clue would tell if the lac operon is on?
The repressor protein has fallen off the molecule.
Lactose is absent.
RNA polymerase is blocked by the repressor.
The cell membrane changes.
Answers
Answer:
RNA polymerase is blocked by the repressor
The lac operon is on when the repressor protein get fallen off the operator.
What is Lac operon?An operon or a group of genes with a single promoter, which encodes genes for the metabolism and transport of lactose in E.coli and other bacteria. In the process, the group of three genes need to be turned on before the bacterium, that is, E.coli can utilize lactose as food.
In the absence of lactose, the lac repressor, that is, the DNA-binding protein combines with the region known as the operator that switches off the lac operon. When binding of lactose takes place with the repressor, it makes the repressor to fall off the operator, hence, turning the operon on.
Thus, when the repressor protein gets fall off the molecule, it shows that the lac operon is turned on.
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Related Questions
Jane told Jill that the name "sunflower' comes from the fact that sunflowers follow the sun in the sky throughout the day. Jane said
that sunflowers actually turn around on their stems to find the sun. To test this idea, Jane and Jill designed an experiment. They
grew a pot of sunfowers outside in natural sunlight, one pot in the house near, but not directly in front of a window, and the final pot
inside the house, away from all windows. All other growing conditions were the same: soil, water, pot size. The girls could not
regulate the outdoor temperature, but since it was spring, the day and night temperatures were pretty close to the indoor
temperature
What would be the next logical step in this experimental design?
to water the plants at exactly the same time each day
to place a shade over the window at different times throughout the day
to track the direction the outdoor sunflower heads were facing throughout the
day
to track the direction the sunflower heads were facing each hour throughout the
day
Answers
Answer:
The correct option is D) to track the direction the sunflower heads were facing each hour throughout the day.
Explanation:
The next step that Jane and Jill should take is to track the direction of each sun flower. They should also check whether the sunflower that is placed in the Sun is the only one that tilts or whether the other sunflowers also tilt. After properly tracking the results, they should be able to draw the results and deduce a conclusion. Hence, Option D is correct.
When the carbon atoms of the glucose molecule are broken apart in glycosis and the Rebs cycle, what is the result.
Answers
Answer:
the correct answer is CO2 and ATP
Structures that are similar in structure but different in function
Answers
Answer:
Some organisms have anatomical structures that are very similar in embryological development and form, but very different in function. These are called homologous structures. Since these structures are so similar, they indicate an evolutionary relationship and a common ancestor of the species that possess them
Explanation:
true or false?? it’s in the picture. i hope it’s easy to read
Answers
The statement that All organism that are internal fertilizers develop theri offerings internally is true
What organisms fertilize internally?
When a female organism undergoes internal fertilization, the procedure takes place inside her body. Mammals, reptiles, birds, and certain fish species all exhibit this frequently. The male gametes, or sperm, are placed inside the female reproductive canal during internal fertilization, where they join the female gametes, or eggs, to complete the fertilization process.
Internal fertilization occurs in species like humans, where the embryo grows inside the body of the female until it is ready to be birthed. In contrast, fertilization happens outside the body when using external nutrients, usually in water for aquatic organisms.
Most bony fish, numerous reptiles, some cartilaginous fish, the majority of amphibians, two mammals, and all birds exhibit this. Insects and reptiles lay leathery eggs, whereas birds and turtles lay eggs with
Which describes a population depending on an abiotic factor?
Answers
Final answer:
A population's dependence on an abiotic factor is illustrated by how non-living environmental elements like temperature and water influence the living organisms of an area. Ecologists use tools like demography to understand population dynamics and the balance of ecosystems. Abiotic factors are central to defining the characteristics and inhabitants of a biome.
Explanation:
Describing a population depending on an abiotic factor involves understanding how non-living elements of the environment, such as temperature, water, and sunlight, affect the organisms living within a particular area. A key example is how the amount of rainfall and temperature can influence soil quality, which in turn affects the types of plants that can thrive in an ecosystem. This subsequently determines the types of animals that inhabit the area since they depend on the plants for food, shelter, and breeding grounds.
To study these interactions, ecologists apply statistical tools like demography. They explore how population dynamics are influenced by both biotic and abiotic factors, which includes analyzing how various reproductive strategies impact the long-term viability of a population. This multi-faceted approach helps ecologists understand the complex web of dependencies in natural ecosystems.
The interplay between abiotic factors and biotic components defines the structure and character of a biome. For instance, in aquatic ecosystems, abiotic factors such as salinity, light penetration, and water temperature are crucial in determining which species can survive and flourish. All these components form the intricate mosaic of interactions that dictate life in various habitats.
What is a scientific theory?
A.
a reasonable guess based on instinct
B. an imaginative idea explaining natural phenomena
C. a broad, evidence-based explanation for a phenomenon
OD.
a tentative statement with little or no predictive power
Answers
Answer:
C. a broad, evidence-based explanation for a phenomenon
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Answers
Answer:the first on is a convergent boundary and the second also looks like a convergent boundary
Explanation:
Which is an advantage of sexual reproduction over asexual reproduction?
Answers
Answer:
in sexual reproduction we get genes from both our parents and we have a combination of them...that leads to genetic diversity...more diversity means more chances to survive different environment conditions.... in asexual reproduction.. offsprings are identical.if environment conditions are rough...all of them won't stand a chance...and also....in sexual reproduction genetic variation can lead to evolutionary advancements
Today, cells are classified in two groups according to whether they contain membrane - bound
Answers
Final answer:
Cells are classified based on whether they have a membrane-bound nucleus into prokaryotic and eukaryotic cells in Biology.
Explanation:
The subject of this question is Biology. The student is asking about the classification of cells based on whether they contain membrane-bound nuclei.
Based on whether they have a nucleus, there are two basic types of cells: prokaryotic cells and eukaryotic cells. Prokaryotic cells do not have a membrane-bound nucleus, while eukaryotic cells do have a membrane-bound nucleus.
For example, animal cells, plant cells, fungal cells, and protist cells are classified as eukaryotic cells, while bacterial cells are classified as prokaryotic cells.
Question 10 of 10
2 Points
What does polymerase chain reaction (PCR) do?
O
A. Cuts a DNA sample into fragments
O
B. Separates DNA fragments by size
O
c. Provides an overall picture of a person's chromosomes
O D. Makes more copies of a sample of DNA
Answers
Option D
polymerase chain reaction (PCR) do Makes more copies of a sample of DNA
Explanation:
A procedure to create several portraits of a distinct DNA section is termed as Polymerase chain reaction. In other words, it is a lab routine handled to compose various representations of a portion of DNA. PCR is extremely explicit and can be utilized to increase, or model, a particular DNA destination from a hybrid of DNA particles.
In PCR, the effect is regularly cycled within a range of temperature variations, which deduct countless models of the destination range to be exhibited. PCR intends to obtain sufficient of the objective DNA region that it can be examined or applied in some other way.
Amino acid is to protein as
A. fat is to lipid.
B. DNA is to RNA.
C. sugar is to fat.
D. simple sugar is to starch.
Answers
22. Where are most mountains on Earth formed?
A. at volcanic chains
B. at strike slip faults
C. at mid-ocean ridges
D. at convergent plate boundaries
Answers
D.
Most mountains on Earth are formed at convergent plate boundaries
Explanation:
At the convergent boundary, the denser plate (usually an oceanic plate) gets subsided under the less dense plate (usually the continental plate). The stress in the boundary from the colliding tectonic plates causes fissures to develop along the boundary, in the overlying plate. As the denser plate ‘dives’ into the mantle, it melts and this magma rises, with pressure, along the fissures, and explodes violently on the surface forming volcanic arc geographical features.
An example f such a region is the Ring of Fire that is home to mountain ranges like the Andes in South America, Southern Alps of New Zealand, and the Cascade Range of North America.
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Most mountains on Earth are formed at convergent plate boundaries. The correct option is D, at convergent plate boundaries.
Convergent plate boundaries occur when two tectonic plates collide or move toward each other.
There are three main types of convergent plate boundaries:
Oceanic-continental convergence: When an oceanic plate collides with a continental plate, the denser oceanic plate is subducted beneath the continental plate. This subduction process leads to the formation of mountain ranges known as volcanic arcs. Oceanic-oceanic convergence: When two oceanic plates collide, one plate is usually subducted beneath the other, forming a trench. As the subducted plate sinks into the mantle, it can generate volcanic activity, giving rise to island arcs and associated mountain chains. Continental-continental convergence: The collision causes the crust to crumple, resulting in the formation of large mountain ranges. The Himalayas, the Alps, and the Rocky Mountains are some examples.Therefore, the correct option is D.
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Help pls Farming is one example of a human activity that has changed the environment.
Which is the NOT a reason farming has hurt the environment?
It uses large amounts of fresh water
It increased the availability of food for humans
It destroys habitats of many soecies
It contributes to soil erosion and desert formation
Answers
Farming increased the availability of food for humans is NOT a reason farming has hurt the environment.
Explanation:
Farming requires the tillage of land and therefore loosens the soil such that it is easily carried by agents of soil erosion – like wind and water.
In addition, most farming methods practice monoculture hence reducing the biodiversity of ecosystems in the region. Poor biodiversity leads to loss of species and low capacity to adapt to environmental changes/.
Farming also requires water to water the plants. This water is usually sourced from freshwater bodies like rivers and lakes. Often, this water is overdrawn leading to depletion of water to the environment denying other species their share of water.
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In what type of ecosystem can this population be found?
I chose Biome to be desert and Organism to be armadillo. Plz help I don’t get what they are asking me!
Answers
Answer:
Armadillo is the barrel-shaped animal that lives mostly in hot and warm areas like: rain forests, grasslands, and semi-deserts.
Explanation:
Biome is the habitat where the organisms live. As we know different organisms have different comfort zone of temperature, environment etc. for living.So some live in the cold polar areas where some in the hot desserts.Similarly, Armadillo is an organism that has adopted itself to live in the warm areas of rain forests and semi desserts.Armadillo is commonly found in the grasslands of Central America.59:44
Which property of soil depends on the size of particles?
O color
O odor
O temperature
O texture
Mark this and return
Next
Submit
Answers
Answer:
The answer is O. Texture
Explanation:
Answer:
the answer is d texture
Explanation:
Which of these structures a
mese structures are found in plant cells but not in animal cells?
Answers
Answer: Cell wall and chloroplasts
Explanation:
Before the three-dimensional structure of DNA was discovered, scientists knew that DNA contained nitrogenous bases. The table below shows the percentages of the nitrogenous bases in a DNA sample. Which rule can be used to determine the percentages of the missing nitrogenous bases? Complete the table AND explain your answer.
Answers
Chargaff's rule will be applied to know the percentage of missing bases.
The table is filled and shown in attachment.
Explanation:
According to the Chargaff's rule, the base pairs of pyrimidine and purine should have the ratio of 1:1.
It is based on the principle that Guanine bonds with Cytosine should be in equal concentration while Adenine bonds with thymine should be in equal concentration. Chargaff rule applies to the DNA only.
Final answer:
Chargaff's rules can be used to determine the percentages of the missing nitrogenous bases in DNA. According to these rules, the concentration of adenine is always about the same as the concentration of thymine, and the same is true for guanine and cytosine. If the percentage of thymine is known, the percentages of adenine, guanine, and cytosine can be calculated accordingly.
Explanation:
Chargaff's rules can be used to determine the percentages of the missing nitrogenous bases in the DNA sample. According to Chargaff's rules, within each species, the concentration of adenine (A) is always about the same as the concentration of thymine (T), and the same is true for the concentrations of guanine (G) and cytosine (C). Therefore, in the given DNA sample, since the percentage of thymine is 22%, the percentage of adenine will also be 22%. Additionally, since adenine and thymine always pair up, the sum of their percentages will be 44%. Similarly, the sum of the percentages of guanine and cytosine will also be 44%, and since the percentages of all the nitrogenous bases should add up to 100%, the percentages of guanine and cytosine will be 56%/2, which is 28% each.
Most grasses of the prairies
are bunchgrasses
grow in clumps
grow in tufts
are sod-forming grasses
Answers
Answer:
are bunchgrasses
Explanation:
How are island archipelagos also called island arcs formed.
Answers
Answer:
Island archipelagos are called island group is a chain or cluster or collection of islands.
Explanation:
Archipelago is derived from Greek Word that means chief sea.
It is isolate and contain large amount of water or large land mass
Ex-Scotland has 700 islands that is surrounding the mainland which form an archipelago.
Answer:
When two oceanic plates converge, one of the plates sinks underneath the other and forms a deep depression called ocean trench. The plate sinks further down into the mantle and begins to melt. The molten rock (magma) rises toward the surface from the melting plate forming a chain of volcanic islands (island arcs) behind the ocean trench.
Explanation:
The Earth's crust is divided into several hard and rigid tectonic plates that slide over the mantle. Tectonic plates can interact in three different ways: converge (move toward one another), diverge (move away from one another) or transform (slide past one another). The plate margins are the boundaries where plates meet and they are of three kinds: oceanic-oceanic, continental-continental, and continental-oceanic.
When two oceanic plates converge, one of the plates sinks underneath the other and forms a deep depression called ocean trench. The plate sinks further down into the mantle and begins to melt. The molten rock (magma) rises toward the surface from the melting plate forming a chain of volcanic islands (island arcs) behind the ocean trench.
An island arc comprises a curving series or group of volcanic islands that form near the convergent boundary of two tectonic plates. They are formed from the volcanic activity along a subduction zone, where one oceanic tectonic plate subducts (one plate sinks under another plate into the mantle of the Earth) another oceanic plate. This movement pushes the lower plate further deeper to a point where the temperature is sufficient to melt the subducted plate and results in the production of magma directly below the top tectonic plate. This magma then rises through fractures and reaches the upper crust and forms volcanoes which eventually rise high enough to become islands. The islands of Japan, the Aleutian Islands, etc are examples of island arcs.
When two continental plates converge, they collide and compress to create complex mountain ranges having great height. The Himalayas formed by the collision of the Indian-Australian plate and the Eurasian plate is an example.
During the convergence of continental and oceanic plates, the denser oceanic plate sinks below the continental plate and a chain of volcanoes known as a volcanic arc are formed. The examples of volcanic arcs are the Cascade Mountains of North America and the Andes Mountains of South America.
Which of the following is the best explanation for the presence of light -colored lizards in the white sands region of New Mexico ,when darker lizards in surrounding areas
Answers
Light-colored lizards in New Mexico's white sands region likely have evolved camouflage coloration to avoid predators, a process driven by natural selection that favors lizards whose coloration blends into their environment.
Explanation:The presence of light-colored lizards in the white sands region of New Mexico while darker lizards populate surrounding areas can likely be explained through the concept of camouflage as an adaptive feature for survival. These lizards have likely evolved coloration that allows them to blend into their specific environments to avoid predation. In regions with white sands, lighter coloration makes the lizards less visible to predators, enhancing their chances of survival. On the other hand, darker lizards in areas with darker soils and rocks would similarly benefit from a coloration that blends in with their surroundings, as their coloration also acts as camouflage. This adaptation process is driven by natural selection, where individuals that are better able to avoid predators because of their coloration are more likely to survive and reproduce.
what are some activities that cells engage in that require energy
Answers
Answer:
Activities like cell division, photosynthesis, active transport, transmission of nerve impulses etc. needs energy.
Explanation:
Energy is the basic element that makes the cellular processes in our body to occur.These energy required is released from food and storing it as ATP.The process of cell division is a continuous and important one which requires energy for its continuation. Similarly other activities of cell that provides us different functionability of our body parts requires energy as well.What does an antibiotic do exactly
Answers
Answer:
antibiotics tend to reduce/stop pain for a while but the bacteria/ virus may eventually be resistant to it
Explanation:
please give brainliest just need 4 more
Laboratory Re
3. MEIOTIC DIVISION
a. Considering meiosis in humans, indicate the:
1. number of chromosomes in the parent cell
2. number of chromatids in daughter cells formed by first division
3. number of chromosomes in daughter cells formed by first division
4. number of chromosomes in daughter cells of second division
5. number of haploid cells formed by meiotic division of parent cell
Answers
1. Number of chromosomes in the parent cell is 46
2. Number of chromatids in daughter cells formed by first division is 46
3. Number of chromosomes in daughter cells formed by first division is 23
4. Number of chromosomes in daughter cells of second division 23
5. Number of haploid cells formed by meiotic division of parent cell is 4
Why is fresh water a limited resource?
Groundwater is too difficult to access
Most water covering Earth is salt water.
The supply of water on Earth decreases over time.
Too much water is wasted on irrigation
Answers
Answer:
The supply decreases over time
Fresh water is a limited resource because too much water is wasted on irrigation.
What is irrigation?Irrigation is defined as the artificial means of watering plants in agriculture which includes canals from underground water.
This process in some areas are the only source of water for farming and this leads to wasting of excess fresh water on irrigation.
Therefore, fresh water is a limited resource because too much water is wasted on irrigation.
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a solution of ph6 contains __________ h+ than the same amount of a solution of ph8
Answers
Answer:
A solution at pH 6 contains 100 times more H+ than the same amount of solution at pH 8.
Explanation:
pH of a substance determines the hydrogen ion concentration of a solution. Acidic solution tend to have a higher concentration of H+ ions as compared to that of water. They have a concentration greater than 1 × 10^{-7} M. Basic solutions have lesser concentration of H+ ions as compared to that of water. They have a concentration lesser than 1 × 10^{-7} M. A solution from pH range 1 to 6 will be acidic. A solution from pH rage 8-10 will be basic.
The process of plant respiration
A.
uses all the energy released during photosynthesis.
B.
releases energy that plants can use for life processes.
C.
releases oxygen to Earth's atmosphere.
D.
produces food that plants need for photosynthesis.
Answers
Answer:
C
Explanation:
Answer:
B
releases energy that plants can use for life processes.
Explanation:
it is correct on study island
There are many factors that influence the number of different kinds of plants in a biome. Why is elevation, or height, a factor that influences what kinds of plants can live in any certain biome on Earth?
Answers
Answer:
A: The elevation helps to determine the temperature of the biome.
Explanation:
PLEASE HELP
From your knowledge about the distribution of electrons in their shells and from the atomic number (in parentheses), indicate the most likely charge on the ion when this atom forms an ion. (Remember the 2-8-18 shell distribution.)
Oxygen (8)
+1
+2
-2
-1
Answers
Answer:
The correct option is -2.
Explanation:
Oxygen atom will have two electrons in its first shell and six electrons in its outermost, valence shell. To become stable, an oxygen atom will need to gain two electrons so that it has 8 electrons in its outermost, valence shell. When oxygen will gain two electrons from another atom, it will get a charge of -2. This is because it has acquired two more negative charged electrons. Hence, the correct option is -2.
Answer:
-2
Explanation:
What molecule is used to cut out a section of DNA?
Answers
Answer: restriction endonuclease.
Explanation: restriction endonuclease recognize a specific site at a DNA molecule called restriction site and attach to it and cleave DNA into pieces by the cleavage of phosphodiester bond. Restriction site are few nucleotides in length found in the middle of the polynucleotide chain.
what organ is responsible for secreting the parathyroid hormone to get the body back to homeostasis?
Answers
Answer:
The organ is responsible for secreting the parathyroid hormone to get the body back to homeostasis is parathyroid glands .
Explanation:
These parathyroid glands that are responsible for secreting the parathyroid hormones are smaller glands that are situated in the front of the neck. This parathyroid hormone is vital for maintaining and controlling the levels of calcium in the our body. This parathyroid glands some times secretes too high or too low hormone leading to hyperthyroidism and hypothyroidism. The hyperthyroidism is a state when large amount of hormone is secreted than required. Conversely hypothyroidism, occurs when the less amount of hormone is released.
The parathyroid glands are responsible for secreting the parathyroid hormone (PTH) to get the body back to homeostasis by increasing blood calcium concentrations.
Explanation:The organ responsible for secreting the parathyroid hormone (PTH) to get the body back to homeostasis is the parathyroid glands. The parathyroid glands produce and secrete PTH in response to low blood calcium levels. PTH increases blood calcium concentrations through various mechanisms, including enhancing reabsorption of calcium by the kidneys, stimulating osteoclast activity, and stimulating the production of calcitriol to enhance absorption of dietary calcium by the intestines.
Bones: PTH stimulates the release of calcium from bones, where it is stored. This process, called bone resorption, increases the amount of calcium in the bloodstream.
Kidneys: PTH promotes the reabsorption of calcium from the urine back into the bloodstream. It also decreases the reabsorption of phosphate in the kidneys, indirectly increasing calcium levels.
Intestines: PTH indirectly enhances the absorption of calcium from the intestines, primarily through its effects on vitamin D metabolism.
By orchestrating these actions, PTH helps to regulate blood calcium concentrations, which is crucial for various physiological functions, including muscle function, nerve signaling, blood clotting, and bone health. This demonstrates the importance of the parathyroid glands and PTH in maintaining calcium homeostasis in the body.
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