Why do viruses only infect specific types of cells?.

Answers

Answer 1
No one knows exactly when viruses emerged or from where they came, since viruses do not leave historical footprints such as fossils. Modern viruses are thought to be a mosaic of bits and pieces of nucleic acids picked up from various sources along their respective evolutionary paths. Viruses are acellular, parasitic entities that are not classified within any domain because they are not considered alive. They have no plasma membrane, internal organelles, or metabolic processes, and they do not divide. Instead, they infect a host cell and use the host’s replication processes to produce progeny virus particles. Viruses infect all forms of organisms including bacteria, archaea, fungi, plants, and animals. Living things grow, metabolize, and reproduce. Viruses replicate, but to do so, they are entirely dependent on their host cells. They do not metabolize or grow, but are assembled in their mature form.
Viruses are diverse. They vary in their structure, their replication methods, and in their target hosts or even host cells. While most biological diversity can be understood through evolutionary history, such as how species have adapted to conditions and environments, much about virus origins and evolution remains unknown.

Related Questions

Charlie is having trouble moving his arms and legs. Charlie’s doctor diagnoses him with amyotrophic lateral sclerosis (ALS). ALS prevents Charlie’s brain from signaling his arms and legs to move. Which type of tissue does ALS involve? A. connective B. epithelial C. fat D. muscle E. nervous

Answers

Answer:

The correct answer is E. Nervous

Explanation:

Answer:

E. nervous

Explanation:

I just got it right on the test

What is the name of the enzyme that digests starch?

Answers

Answer:

alpha-amylase

Explanation:

(:

Answer:

Amylase

Explanation:

Enzymes typically have names that based on whatever it is they break down, with the suffix "ase" at the end.  In the case of enzymes that break down sugars, the "ose" at the end of the name of the sugar is typically replaced with "ase" to indicate the enzyme.  The proper name for starch is amylose, and the enzyme that breaks it down is amylase.

When a volcano erupts, dust and ash are blown into the atmosphere. The eruption directly reduces the transfer of energy from.

Answers

When a volcano erupts, it releases hot molten rocks and gases into the earth's surface thereby reducing the transfer of energy from the sun to plants.

What is a volcano?

A volcano is an opening in the crust of  large massive object, such as mountains on the Earth, which allows hot lava, volcanic ash, and gases to escape from a magma chamber into the atmosphere.

When a volcano erupts, it releases hot molten rocks and gases into the earth's surface. This reduces  the transfer of energy from the sun to plants as it blocks the rays of the sun from getting to the plants.

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Are proteins are made on the Golgi apparatus. True or False?

Answers

true

The Golgi apparatus, or Golgi complex, functions true

as a factory in which proteins received from the ER are further processed and sorted for transport to their eventual destinations: lysosomes, the plasma membrane, or secretion. In addition, as noted earlier, glycolipids and sphingomyelin are synthesized within the Golgi.

hope it helps...!!!

True the Golgi apparatus or golfi functions true

The role that the environment plays in determining which species survive is referred to as

Answers

Answer:

natural selection

Explanation:

Please help me I’m stuck on this question!!!

Answers

Answer:

kingdom 1

Explanation:

Which of the following is NOT a characteristic of fungi?
1. They have chlorophyll.
2. They are heterotrophic.
3. Most fungi reproduce through spores.
4. They feed off dead organic matter.
5. They are not plants, protists, or animals.

Answers

Answer:

5

Explanation:

Fungi, once considered plant-like organisms, are more closely related to animals than plants.. Most fungi produce a large number of spores.

Glycine (C2H5NO2) is added to a growing peptide chain containing methionine (C5H11NO2S) and alanine (C3H7NO2). Which of the following peptide chain orientations best displays the growing chain and peptide bond between the amino acids?

Answers

Answer:

Beta sheets?

Explanation:

I don't have picture to answer it but based on my understanding, glycines are very flexible thus they are uncommon in alpha helix (proline are rigid and kink stuff thus they are uncommon in right handed alpha helix).

Therefore, beta sheets should be the best orientiation.

what's the answer to this

Answers

Answer:

D

During respiration in humans oxygen is used then h20 abd co2 is released which photosynthesis uses for build up

What are the different types of relationships that can exist between species?

Answers

Answer:

competition, predation, commensalism, mutualism and parasitism.

Explanation:

hope this helps!

Large predatory fish, which may be part of your diet at times, usually at the third fourth trophic level. Explain why it may not be a good idea to eat these fish often, if at all

Answers

Answer:

because of biomagnification

Explanation:

fish that eat big fish like sharks contain a lot of mercury compared to small fish

Describe how increasing light intensity affects the rate of photosynthesis.

Answers

As light intensity increases in photosynthesis so does the rate of photosynthesis. The more light there is the more photosynthesis in the thylakoid membrane is activated. However, the light intensity can only increase up to a certain point before the rate of photosynthesis no longer increases. Once there is a sufficient intensity of light, the ATP and NADPH that come from the light reactions will be in abundance. For the remaining part of photosynthesis to occur (the Calvin cycle), carbon dioxide is needed.

Hope this helped :))

How does group (animal) behavior apply to territoriality?

Answers

The bigger,stronger and more aggressive animal wins the better territory and keeps it safe against others.

I NEED HELP!!!

Which of these is not one of the parts of an atom?

A. electron

B. proton

C. neutron

D. All of these are parts of an atom.

Answers

Answer:

d. all of them are parts of an atom

Explanation: trust

Answer:

Those are all parts of an atom. Electrons have negative charge, protons have positive charge, and as you may have guessed, neutrons have a neutral charge.

Population decline causes an extreme genetic drift called a ___
A) nonrandom mating
B) founder effect
C) bottleneck
D) stabilizing effect

Answers

Population decline causes an extreme genetic drift called a bottleneck effect. The correct option is C.

What is bottleneck effect?

The bottleneck effect describes how a population's size is reduced and then increased, affecting the distribution of genetic variation among its members.

It happened when the population reduced severely. Events like natural disaster or decline of the population.

Thus, the correct option is C) bottleneck effect.

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Explain diffusion's role in how living things obtain energy.

Please explain its role, and how living things obtain energy, not a chart of something else. Thank you ^^

Answers

It obtain energy by eating animals such as lions and bears

5. A mother's diet is very important throughout her pregnancy but especially during the first
trimester. Vitamins and minerals provide essential nutrients during this stage of
development. Vitamins A, D, and Beta Carotene help bones and teeth grow and harden,
Vitamin E is used in the formation of red blood cells and muscles, and Vitamin C helps build
a healthy immune system. Which of the following would most likely result from a poor diet
during the first trimester?
A. Less production of urine
B. Response to outside stimulus
C. A functioning nervous system
D. Abnormal development of the heart and lungs

Answers

Probably D since it’s makes the most sense

Poor nutrition during the first trimester of pregnancy can have negative effects on both the mother and the unborn child. A poor diet is more likely to cause improper heart and lung development.

What is the dependence of the bones ?

The growth of bones and teeth depends on vitamins A, D, and beta-carotene, whereas the development of red blood cells and muscles depends on vitamin E. A robust immune system may be built using vitamin C.

Without these nutrients, the baby's heart and lungs could not develop normally, which might result in life-threatening medical issues. Because the body is unable to absorb the essential nutrients from meals, poor nutrition can also result in reduced urine output.

Dehydration from this may result, which may further contribute to healthcare issues. Additionally, because the baby's nervous system could not be fully formed, a poor diet during the first trimester can result in a diminished reaction to external input.

Problems with motor and cognitive development may result from this. To sum up, a bad diet throughout the first trimester might result in major medical issues for both the mother and her unborn child. A poor diet is more likely to cause improper heart and lung development.

In addition, a poor diet might cause issues with motor and cognitive development, reduced sensitivity to external stimuli, and decreased urine output. It is therefore essential that pregnant women eat a balanced diet with the necessary vitamins and minerals to ensure the health of both mother and baby.  

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What happens when Earth rotates on it's axis and how long does it take?

Answers

Earth spins on its axis, and it takes one day to do so. In one day Earth makes one rotation on its axis. Earth also travels on an elliptical orbit around the Sun. And it takes one year to make a complete trip.

Help me please!!
Topic
Who Thought This?
Lamarck, Darwin,
or both?
1. Organisms have change over time.
2.
Organisms changed because they wanted to survive.
3.
There was variation in a population.
4.
Certain traits helped organisms survive and reproduce
Better than other organisms without those traits.
5. Organisms can never become extinct.
6. The environment had something to do with why
organisms changed.
7. Parents are able to pass on at least some of their traits
to their offspring.
8. Parents are only able to pass on traits that they were
born with.
9. Organisms could decide to change something about their
body and pass on that change to their offspring.
10. Organisms are still changing.

Answers

Answer:

1. Both

2. Lamarck
3. Darwin
4. Darwin
5. Lamarck
6. Both
7. Both
8. Darwin
9. Lamarck
10. Both

Explanation:

in 1, we need time therefore both. In 2, Lamarck because in Darwinian evolution, species change not organisms. In 3, Darwin because of natural selection, mutation, and probably a little bit of heredity. 4 is Darwin because in Lamarckian evolution. 5 is Lamarck because based on natural selection, organisms should go extinct. 6 is both because they both rely on the environment. 7 is both because of heredity. 8 is Darwin because in Lamarckian evolution, traits acquired throughout ones lifetime can be passed down to offspring. 9 is Lamarck because in Darwinian evolution, organisms do not decide their traits. 10 is both because both idea ssupport the idea that organisms, be it in Lamarckian or Darwinian evolution, are still and will carry out on changing.

Learning Task 1: WORD UP

I Procedure: Identify the word(s) being described. Choose from the words given in the box.

Food chain\ Energy pyramid
Food Web\Ecosystem\
Producers\Carnivores\ Decomposers\ Lowdiversity\High biodiversity \Trophic level

1. Feeding relationship that exists among organisms.

2. Refers to each step in the transfer of energy and matter in a community.

3. A community or group of living organisms that live in and interact with each other in a specific environment.

4. A diagram that compares the energy used by producers, primary consumers, and other trophic levels.

5. Has high number of species living in an ecosystem.

6. When there are a few prominent species and a low number of other species within the habitat.

7. Organisms that feed on and break down organic matter.

8. Organisms that can make their own food in the ecosystem.

9. Animals that feeds on flesh,

10. A system of interlocking and interdependent food chains.​

Answers

The words for the descriptions are food chain, trophic level, energy pyramid, high diversity, low diversity, etc. respectively.

EcologyThe feeding relationship that exists among organisms is termed the food chain.

Each step in the transfer of energy and matter in a community is termed the trophic level.

A community or group of living organisms that live in and interact with each other in a specific environment is termed an ecosystem.

A diagram that compares the energy used by producers, primary consumers, and other trophic levels is known as the energy pyramid.

An ecosystem with a high number of species is said to be of high diversity.

An ecosystem with a few prominent species and a low number of other species is said to be of low diversity.

Organisms that feed on and break down organic matter are said to be decomposers.

Organisms that can make their own food in the ecosystem are termed, producers.

Animals that feed on flesh are called carnivores.

A system of interlocking and interdependent food chains is called a food web.

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Which of the following is a way to conserve water quantity?
O Buying bottled water
O Reducing the amount of detergent used in the laundry
O Decreasing the amount of electricity used for appliances
O None of the above

Answers

Answer:

none of the above

Explanation:

The options cited in the question do not influence water conservation. Attitudes that can promote water conservation are: tightly closing the taps, adjusting the discharge valves and eliminating water leaks, do not leave the shower turned on, brush your teeth with the tap closed, use the bucket and no hoses to wash the water. car and sidewalks, use the water that comes out of the washing machine to wash sidewalks, do not throw garbage in the river, do not throw garbage on the beach and publicize and participate in educational campaigns for water conservation.

Wetlands and estuaries are critical ecosystems, but do not require protection. please select the best answer from the choices provided t f

Answers

False. Wetlands and estuaries require protection just like every other ecosystem.

Habitat protection

Wetlands and estuaries represent some of the major ecosystems in the world. They serve as habitats for important plant and animal biodiversity as well as offer some vital services for mankind.

Overexploitation or abuse of wetlands and estuaries will lead to the loss of important species and services to mankind. Thus, protecting them will not only protect the habitats of important species but will also protect the interest of mankind generally.

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The cells are first placed in freshwater by making a wet mount slide of red onion cells. What type of solution environment are you starting with?

PLS HELP WILL GIVE BRAINLIEST

Answers

The type of solution environment that is been stated is hypotonic solution.

What is hypotonic solution?

Hypotonic solution is a solution in which the Concentration of particles in side the cell is less than outside. in this call the cell swells up and burst.

Therefore, The type of solution environment that is been stated is hypotonic solution.

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Explain why using pheromones to control populations of pests can be more Earth-friendly than other means. ​

Answers

Answer:

The reason why using pheromones to control populations of pests is better than other ways is because they are biodegradable and species-specific compounds which means that they don't harm beneficial organisms or humans.  Therefore, this would make it more Earth-friendly than other means.

Why are children in the United States still vaccinated for polio?

because there are polio outbreaks overseas
because it is required by federal mandates
because it is still an active disease in the United States
because polio has been officially eradicated

Answers

Answer:

because it is till an active disease in the United states

Answer:

because it is required by federal mandates

Explanation:

Inactivated polio vaccine (IPV) is the only polio vaccine that has been given in the United States since 2000. It is given by shot in the arm or leg, depending on the person's age. Oral polio vaccine (OPV) is used in other countries. CDC recommends that children get four doses of polio vaccine

Your family prepared an emergency plan in case of a natural disaster. Look at the list below and then select one additional item that should be included to better prepare your family.

A list of 15 items that should be in the emergency kit
The safest place in the house
A safe place for the family pet
A safe place in the neighborhood
A wallet card for each family member
A) A list of friends for each family member
B) A map of the house
C) An enlarged picture of each family member
D) Two emergency contacts

Answers

Answer: A safe place in the neighborhood seems the most reasonable or  D

Explanation:

A map of the house  wouldn't make sense because im pretty sure they would know around there house. An enlarges picture of each family member would also not make sense because it is just not helpful at all. A wallet card for each family wouldn't help them in there situation. A safe place for the family pet would help the pet but not everyone in the house so no. A list of friends for each family member would really be useful.

Answer:

D

Explanation:

It sounds way more reasonable then any of these questions.

help me asap!!!!!!!!!

Answers

Answer: Genus, Species

Explanation: I’m pretty sure it’s that

Structure in an animal cell that helps to organize cell division

Answers

Answer:

Centrioles are located near the nucleus and help organize cell division.

Compare plant and animal cells.

Answers

Answer:

Some similarities are that both plant and animal cells have a nucleus, both have a mitochondria, both have a cell membrane, and both contain cytoplasm.

Also, some differences between plant and animal cells are plant cells have cell walls while animal cells do not, only plant cells have chloroplasts, and plant cells usually have larger vacuoles than animal cells.

Explanation:

"The graphic below shows how the three domain and five kingdom classification systems fit together. According to this diagram, a single-celled protist is most closely related to which other group?"

Answers

It is not possible to determine which organism is most closely related to a protist in this diagram because it does not reflect evolutionary relationships.

What is an evolutionary diagram?

An evolutionary diagram is a graphical representation of the descendence relationships between individuals.

A cladogram is one of the most widely used evolutionary diagrams in order to trace descendence from a common ancestor.

In conclusion, it is not possible to determine which organism is most closely related to a protist in this diagram because it does not reflect evolutionary relationships.

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