Muscle cells can contract, a function unique to them, with skeletal muscles enabling bone movement and cardiac muscles pumping blood. Striations in skeletal and cardiac muscles arise from the alignment of sarcomeres, giving them a banded appearance. Smooth muscles, in contrast, are not striated and are located in the GI tract, among other organs.
Explanation:Differences Between Types of Muscle Tissue
Muscle cells are specialized to contract and produce movement, a function not found in other cells. Muscle cells, specifically skeletal muscles, are responsible for moving bones, while cardiac muscles contract to pump blood within the heart. Unlike cardiac and skeletal muscle, smooth muscle cells, which are found in the gastrointestinal tract among other locations, are not striated due to their arrangement in sheets rather than bundles.
Striated muscles, such as skeletal and cardiac muscles, are characterized by their banded appearance, which is due to the sarcomere structure within the muscle fibers. While both types of striated muscles contain sarcomeres, which are the functional units of muscle contractions, their arrangement is slightly different in each, contributing to their unique appearances and functions.
The function of the skeletal muscle is to permit voluntary movement, as exemplified by the action of the biceps muscle when lifting an object. In contrast, cardiac muscle function is involuntary and specifically adapted to pump blood through the heart chambers and throughout the body.
what goes wrong during the cell cycle in cancer cells?
Gene mutations cause cancer by speeding cell division or blocking normal system mechanisms like cell cycle arrest or programmed cell death.
What are cancer cells?Cancer is a disease that is caused when cells divide in an uncontrolled manner and spread into the tissues that are in close proximity to them. DNA can become damaged, which can lead to cancer. The majority of mutations that can lead to cancer occur in specific regions of DNA known as genes. Alterations of this kind are also referred to as genetic alterations.
There is an imbalance in the number of chromosomes present in many cancer cells; as a result, there may be an excessive number of chromosomes or an inadequate number. The term "aneuploid" refers to the state of these cells. During the process of replicating DNA, mistakes can happen, which can lead to mutations and even the potential development of cancer.
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How can an increase in biodiversity lead to an increase in ecosystem stability?
a.) A more biodiverse ecosystem is not subject to change.
b.) A more biodiverse ecosystem has a higher chance of adapting to species changes.
c.) A more biodiverse ecosystem has fewer species types to balance.
d.) A more biodiverse ecosystem is subject to fewer natural disasters
Answer: Option B
Explanation:
A biodiversity can be defined interaction between the biotic and abiotic components on earth which helps in the serving the human beings with resources.
The more diverse the biodiversity is more stable it will be. A diverse biodiversity will be adapt more easily to the changes.
Can you place the stages of mitosis in correct order?
What is one evolutionary advantage pteridophytes have over bryophytes?
The answer is B. Pteridophytes have vascular tissue that aids in transport of water and nutrients within a plant.
The Punnett square for a non-freckled parent and a homozygous freckled parent is shown below. What is the probability that their children will have freckles? a 100% b 50% c 0% d 75%
F F
f Ff Ff
f Ff Ff
Answer:
Option A, [tex]100 \\[/tex]%
Explanation:
Let the allele for non freckled trait be represented by “f”
The allele for freckled trait be represented by “F”
Let us consider that freckled trait is dominant over the non – freckled trait.
The genotype for a non – freckled parent will be “ff”
The genotype for a homozygous freckled parent will be “FF”
When a cross is carried out between a non – freckled parent and a homozygous freckled parent , the following offsprings are produced –
f f
F Ff Ff
F Ff Ff
Thus, all the four offsprings have heterozygous genotype. Since we assumed that freckled trait is dominant over the non – freckled trait, all the offsprings would be freckled.
Thus, the probability of a child having freckles would be
[tex]\frac{4}{4} * 100\\= 100\\[/tex]%
Thus, option A is correct.
20 POINTS MORE THAN ONE ANSWER
Which examples of artificial selection are caused by human activity without people even realizing it?
A. an increase of tuskless Asian elephants because of ivory poaching
B. growing human organs from pig stem cells because of increased research on stem cell therapy
C. a decrease in rams’ horn size because of hunters’ preference for long-horned rams
D. cows producing milk with more protein because of genetic engineering
E. chickens producing more meat because of selctive breeding
Answer:
A and C
Explanation:
What is cotton candy made out of?
By conserving energy and making energy transformations more efficient, fossil fuel use could be decreased. True or false
True
Fossil fuels like coal and petroleum takes millions of years to form. The rate of usage of fossils is not equal to its formation. As the rate of formation is slow it is important to use energy in an efficient way so that it is not consumed in a wrong way. The transformation of energy should be more efficient to avoid the wastage of energy. By doing this we can decrease the consumption of fossil fuels as it cause pollution in the environment. The burning of fossil fuel releases carbon dioxide, nitrogen oxide ,and other harmful gases which is injurious to the health of people. So, the fossil fuel should be used in a decreased manner.
T or F
SELECTIVE PERMEABLE membranes allow only certain materials to pass through them T or F
SELECTIVE PERMEABLE membranes allow only certain materials to pass through them
what component of the earth's atmosphere is decreased due to photosynthesis
Why do meteorites that hit earth provide evidence of the composition of earths interior?
Meteorites provide evidence of the composition of Earth's interior through their composition, martian origin, and the presence of organic molecules.
Explanation:Meteorites that hit Earth provide evidence of the composition of Earth's interior for several reasons. First, many meteorites are primitive stones that are similar in composition to the outer layer of the Earth's crust. They contain silicates and metallic grains, which are also present in Earth's interior. Second, the analysis of gas bubbles trapped inside some meteorites has confirmed their martian origin. These bubbles match the atmospheric properties of Mars, providing insights into the composition of both planets. Lastly, the presence of complex organic molecules and amino acids in meteorites suggests that they could have delivered the molecular building blocks of life to Earth.
A gardener accidentally trims the leaves of a green plant too short. The leaves are now much smaller. He notices that the plants grow more slowly than it used to. Which sentence best explains why the plant grows more slowly?
A - The plants has too many thylakoids in its cells
B - The plant now gets too much sunlight to be healthy.
C - The platn has more cholorplast in its cells
D - the plant has less cholorphyll to produce energy.
ASAP (15 points)
In which of the following ways are the conditions around deep sea vents similar to the conditions that existed on early Earth?
A) Only ultraviolet light can reach the depth of the deep sea vents making it much like the light on early Earth.
B) The volcanic gases released from the deep sea vents are similar to those released into the early atmosphere.
C) Water around the deep sea vents contains low concentrations of iron sulfide just as the early oceans did.
D) The water at the depth of the deep sea vents were as cold as the early oceans.
Answer:
The correct answer is B. The volcanic gases released from the deep sea vents are similar to those released into the early atmosphere.
Why is clearcutting an especially damaging forestry practice for species that rely upon older trees for their survival?
a.
Clearcutting removes all trees in a stand, old and young.
b.
Clearcutting specifically removes older trees in a stand.
c.
Clearcutting forces younger trees to mature faster.
d.
Clearcutting is not a damaging forestry practice.
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Insolation is a term used to describe the energy that reaches the earth coming from the Sun.
True
False
Answer:
true
Explanation:
my quiz answers of 7/7 says so
Infants are born with some connections between brain cells. True or false.
Answer:
True
Explanation:
It has been found that during birth, a child possess several neurons as well as synapses. These synapses indicate the connection between the brain cells. During birth a child has 2500 synapses per neuron which indicate pre-established neuron connections. With a scale of 2500 synapses per neuron, a child’s brain has billion of neurons which start developing and deleting additional neurons as a normal part of brain development activity.
Yes, infants are born with some connections already established between their brain cells, which play key roles in learning and memory. As a person grows and learns, new connections are constantly formed.
Explanation:The statement, 'Infants are born with some connections between brain cells' is true. In fact, infants are born with all the neurons (brain cells) they will have in their lifetime and there are already some connections, or synapses, established. The connections between these cells play essential roles in learning, memory and overall cognitive functioning. However, the brain constantly forms new connections as a person experiences and learns new things throughout their lifespan. This is a process known as neuroplasticity.
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The _____ demonstrates the cell theory because it develops cells that fuse to form one giant cell, making up the whole organism. cork slime mold bacteria archaea
Answer:
Slime Mold
Explanation:
Which of these animals is a marsupial?
a. horse
b. opossum
c. platypus
d. whale
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Mendel crossed two plants that were heterozygous for purple flower color. Which genotypes could he have used to represent the cross?
A. PP PP
B. Pp Pp
C. pp pp
D. Pp PP
The answer would be B. Pp'Pp.
Which is an example of a biomass fuel?
A)wood
B)coal
C)natural gas
D)petroleum
Diploid cells have homologous chromosomes. true or false
When a nucleus decays why do the particles fly apart at an extremely high speed? And what holds the particles together in the nucleus of a stable atom?
Which statement best describes the relationship of photosynthesis and energy?
The process of photosynthesis is energy-storing because the process converts light energy into chemical energy, which stored in the bonds of glucose.
The process of photosynthesis is energy-releasing because the process converts light energy into free energy that can be used for cell functions.
The process of photosynthesis is energy-conserving because no energy is used throughout the process of forming glucose and oxygen molecules.
The process of photosynthesis is energy-wasting because photosynthesis is ineff
Answer:
Explanation:
B
Alf lifts weights vigorously for 25 minutes. A few hours after exercise, he notices that his muscles are sore and slightly swollen. His muscle cells have experienced ______________ that led to production of _______________.
Answer:
anaerobic respiration; lactate
Explanation:
Which species is most closely related to the origin moth species?
Answer: Lack of information
Explanation:
You need to give the full question with options to select. As I don't know the answer I can explain Species C 14 is wrong.
Here is the full question:
A scientist is trying to determine how closely related a moth species (Species Z) is to four other moth species (Species A, B, C, and D). He examined the DNA of each species and compared it to the study subject. He then created this table.
Species # of genetic differences
Species A 12
Species B 3
Species C 14
Species D 28
Which species is most closely related to the moth species (Species Z)?
- species A
- species B
- species C (X) Not the answer
- species D
Recent genetic studies have blurred the lines between moths and butterflies, showing that they may not have a true divergence. Moths like the Marbled emperor may share close relations with some butterfly species. The case of the peppered moth demonstrates industrial melanism and the dynamic nature of evolutionary processes within the Lepidoptera order.
Recent genetic studies suggest that moths (Sub-Order Heterocera) and butterflies (Sub-Order Rhopalocera) may not have a true divergence between them, as some species previously classified separately show close genetic relations. The Marbled emperor moth, for instance, which evokes the image of an owl, might be more closely related to certain butterfly species than to other moths. This information comes from a broader understanding of the phylogeny of insects, which is supported by cladograms showing evolutionary relationships.
The phenomenon known as industrial melanism further illustrates the adaptive nature of moths. The example of the peppered moth, Biston betularia, vividly demonstrates this. Before the Industrial Revolution in England, the typically light-patterned peppered moths blended in with lichen-covered trees, avoiding predation. With rising pollution, darker moths had an advantage, and their population numbers surged by the late 19th century. This real-time observation of a population's adaptive response points to shared evolutionary pressures and similarities within the Lepidoptera order, which encompasses both moths and butterflies.
The exchange of oxygen for carbon dioxide occurs in the:
Energy from food must be transformed into the bonds of _________ before it can be used by cells.
a.atp
b.gnc
c.nadp eliminate
d.cellulose
Plants make their own food. The chemical reaction for this process is shown in the equation below. CO2 + H2O + energy C6H12O6 + O2
What are the products in this chemical reaction?
A. C6H12O6 + energy
B. C6H12O6 + O2
C. CO2 + H2O
D. H2O + energy
Answer:
B. C6H12O6 + O2
Explanation:
The process of photosynthesis is exhibited by plants to make their own food. They trap the carbon dioxide and form organic food, that is, glucose in presence of sunlight. The process of photosynthesis uses the energy of sunlight and gives off oxygen as by-product. Hence, glucose (C6H12O6) and oxygen are the products of the process of photosynthesis.
______ is a pesticide that influenced society by increasing crop yield, but it also caused human and animal sickness
Dichlorodiphenyltrichloroethane or DDT is a pesticide and insecticide, which was very useful for the yielding of the crops. The DDT exceptionally increased the crop yield, but this pesticide was very harmful for the human and the animal health.
The DDT was well known for causing decreased fertility and reproduction in birds by causing death of the embryo due to thin egg shells. The DDT was very harmful to the aquatic animals. DDT is a carcinogen to humans, and a well known factor for the induction of breast cancer as well as leukemia, lymphoma, and pancreatic cancer.
Hence, the given blank can be filled with DDT.