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USPshnik [31]
3 years ago
9

N 9 Viruses use the host's machinery to make copies of themselves. However, some human viruses require a type of replication tha

t humans do not normally do. For example, humans normally do not have the ability to convert RNA into DNA. How can these types of viruses infect humans, when human cells cannot perform a particular role that the virus requires?
Biology
1 answer:
Amanda [17]3 years ago
6 0

Answer:

<u>This is because  the Viron  has in its genome a specialized code  for synthesising any missed enzyme for replication that is lacking in the host cell.</u>

<u>An example is the replication of the human  DNA cells by the Immunodeficiency virus(HIV) </u>. Human  cells only have  enzymes for  copying  DNA templates, and   lacks the enzyme to convert the HIV  RNA genome  to human DNA.However these viruses have  in its genome; code for synthesising its own  RNA polymerase enzymes that copies  or transcribed  the   human DNA to HIV RNA.

 <u>This  ability of the viral cell  to code  for the host's enzyme  has a therapeutic effect</u>. Drugs can be targeted at the  viral polymerase enzymes to reduce the replication and therefore toxicity in the host cells.

Explanation:

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it is the thymus

Explanation:

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3 0
3 years ago
The proportions of the bases are consistent within a species; however they do vary between species. Using the base-pair rules, c
Snezhnost [94]

Answer:

The correct answer would be:

                  A         G          C         T

Human:   31          19          19       31

Cow:         28         22      22         28

Salmon:     29       21       21         29

Wheat        27      23        23        27

Yeast         31         19       19         31

Explanation:

According to the rule of Chargaff which states or explains the amount of the A, T, G, and C bases in the DNA molecule. It says that the DNA of any organism should have a pyrimidine and purine ratio of 1:1. This means the amount of A would be equal to T and the amount G should be equal to the amount of C.

It also says that the amount of a and G would be equal to the amount of C and T. So on the base of this we can find the missing value in the table:

                    A         G          C         T

Human:   31          19          19       31   (A= T and G=C)

Cow:         28         22      22         28  (A= T and G=C)

Salmon:     29       21       21         29   (A= T and G=C)

Wheat        27      23        23        27 (100 - A+T = G+C)

Yeast         31         19       19         31 (A= T and G=C)

5 0
3 years ago
Think about a carbon atom that is released into the atmosphere from burning wood in a campfire. If it were to go through the who
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The correct order would be:

1. A tree absorbs the carbon from the atmosphere into its leaves for photosynthesis;

2. A caterpillar gets the carbon by eating the tree's leaves.

3. A bird gets the carbon by eating the caterpillar.

4. The bird flies into a building and dies instantly. It falls to the ground.

5. The bird decomposes and the carbon returns to the atmosphere.

The carbon cycle is very similar to the water cycle, though it has its own unique ways. Once the carbon is released into the atmosphere, it will either be absorbed by the vegetation, or go up into the higher parts of the atmosphere. If it is absorbed by the vegetation, the organisms that eat the vegetation will get it in them. When the predators eat those organism they get the carbon into their organisms. When the predators die, they start to decompose. When they decompose, the carbon is released from them and it returns to the atmosphere, and the whole process goes all over again.

6 0
3 years ago
Which of the following is found in both cellular respiration and in the light reactions of photosynthesis?
alexdok [17]
Glycolysis.......hi....
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What causes the differences in average temperature and the changes
zvonat [6]

Answer:

The Earth's axial tilt is what causes the differences in average temperature that are associated with the change in seasons on Earth

Explanation:

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3 years ago
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