1. Retroviruses are named because their reverse transcriptase a. reverses the ac
ID: 67683 • Letter: 1
Question
1. Retroviruses are named because their reverse transcriptase
a. reverses the action of drugs on viruses.
b. reverses the ability of viruses to associate with cells.
c. reverses the response to antibiotics.
d. reverses the flow of genetic information from RNA to DNA.
e. all of the above.
2. Which of the following structures is responsible for the changes in influenza viruses that necessitates the development of a new vaccine each season?
a. Changes in the envelope phospholipids
b. Changes in the surface spike proteins
c. Changes in the internal capsid proteins
d. Changes in the RNA genome
e. All of the above
3. The release of the viral genome from the capsid is called
a. Endocytosis
b. Uncoating
c. Penetration
d. Biosynthesis
e. Maturation
4. How can an individual end up with spongiform disease?
a. Eating meat with PrPSc (infectious PrP-res)
b. Inherited a mutation in the gene coding for PrPc (PrP-sen)
c. A spontaneous mutation that changes the PrPc form to the PrPSc form
d. All of the above
5. Which of the following explains why viruses are only able to multiply in living cells?
a.)Viruses are too small to multiply outside of living cells.
b.) Viruses do not have the necessary components for self-replication
c.)Their binary fission is controlled by host cell genes
d.) All of the above
Explanation / Answer
1. The answer is d. reverses the flow of genetic information from RNA to DNA. Retrovirus has the enzyme called as reverse transcriptase which converts the RNA to DNA.
2. The answer is b. changes in the surface of spike proteins
3. The answer is b. After penetration the gene replication starts and finally uncoated from the capsid
4. The answer is d. All of the above
5. The answer is b. Viruses do not have the necessary components for self replication
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