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Sladkaya [172]
3 years ago
10

The virus that causes AIDS, HIV (Human Immunodeficiency Virus), derives from SIV (Simian Immunodeficiency Virus). SIV can only i

nfect monkeys. People who hunted wild monkeys were not susceptible to SIV infection because the host range of the virus was species- specific (i.e., restricted to monkeys). Then all of a sudden. SIV gained the ability to infect humans and the HIV/AIDS pandemic began. As a geneticist, how would you explain this? You may answer in very general terms. A full credit answer can be written in one word
Biology
2 answers:
SVETLANKA909090 [29]3 years ago
4 0

Answer:

it can be explain in such a way that there might be a kind of likelihood of cross-species transmission when a person is exposed to one strain versus another.'

it was found through research with  evidence that SIV strains mutate when they enter cells to overcome human-specific barriers to infection, something that had been suspected for a long time.

Explanation:

The first strain of a virus considered the ancestor of HIV, the virus that causes AIDS, was passed to humans in the early 1900s, somewhere near a West African rainforest. Now a study has backed up this theory, by proving forms of HIV can cross between chimps and humans.

sertanlavr [38]3 years ago
3 0

Answer:

Mutation

Explanation:

In genetics, any heritable change of the base-pair sequence of genetic material is referred to as MUTATION.

SIV (Simian Immunodeficiency Virus) must have undergone mutation, which is the basis of genetic variation or evolution

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jolli1 [7]

The plant tissue that is most likely to store water in the cactus plant is vascular tissue.

<h3>What is vascular tissue?</h3>

Vascular tissue is made up of xylem and phloem.

The main function of vascular tissue is to transport water and minerals to parts of plants.

The vascular tissue in the cactus helps to transport water to the spines.

It also stores water for a long period of time.

Thus, the correct option is vascular tissue.

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3 0
2 years ago
How do amino acid sequences influence the properties of a protein?
Katarina [22]
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3 0
3 years ago
Why does the shape of the lighted part of the moon change when viewed from earth?
Irina18 [472]

Answer:

The half of the Moon that points toward the Sun looks bright because it is lit by sunlight. The Moon appears to change shape because we see different amounts of the lit part as the Moon orbits Earth. ... As it moves around Earth, more and more of the lit side comes into view.

4 0
3 years ago
Read 2 more answers
Answer the following questions.
Dafna1 [17]

Answer: reading paper books and magazines,  sleeping in beds under cotton sheets, having a sandwich for lunch , sitting at wooden desks , I picking wildflowers , eating a favorite breakfast cereal.

Explanation: These are all correct because each has to deal with plants. For example, reading the paper books, sleeping in the bed and sitting at the wooden desk all have to due with the products that come from plants. Paper, cotton, and wood are all grown from plants and turned into resources. Next picking flowers, eating foods are also direct examples of how plants help us. Picking flowers that come directly from plants. Then eating food that is grown from plants shows that it is directly plants providing for humans.

6 0
2 years ago
Many species, including some whales and birds, will travel thousands of kilometers during annual migrations. I. Provide one reas
Ivan

Answer:

1- A species can migrate over long distances because they have metabolisms suitable for that, adaptation mechanisms to withstand different adversities. They usually do it to be able to reproduce in ideal climaxes or feed on certain living things or plant species.

2-The existence of oil fields, or oil towers for the manufacture of fuel.

3-Implement electric cars or batteries that do not depend on fuels such as diesel, naphtha.

Explanation:

In this exercise it is good to highlight that during the migration of animals of different species their numbers decreased both to reach the territory to which they migrate and by human intervention in nature in a harmful way.

7 0
3 years ago
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