Viruses

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created 3 years ago by Ashley_Nicodemus
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Mastering biology
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1

Which statements about viruses are true?Select the four statements that are true.

  • HIV contains reverse transcriptase.
  • Enveloped viruses bud from the host cell.
  • The capsid enters the host cell if the virus is enveloped.
  • A retrovirus contains RNA.
2
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The pointer is indicating the virus's _____.

genome

3

Viral DNA makes mRNA by the process of _____.

transcription

4

The lytic cycle of bacteriophage infection ends with the _____.

rupture of the bacterium

5
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The pointer is indicating the _____.

viral protein coat

6

As a result of the lytic cycle, _____.

the host cell's DNA is destroyed

7

In the lysogenic cycle _____.

viral DNA is replicated along with host DNA

8
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Cycle A is the _____ cycle and cycle B is the _____ cycle.

lytic ... lysogenic

9

The genetic material of HIV consists of _____.

single-stranded RNA

10
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Which of these binds to receptor molecules on the host cell membrane?

A

11

What is the function of reverse transcriptase?

It catalyzes the formation of DNA from an RNA template.

12

What is the source of a viral envelope?

host cell membrane

13

Which of these is reverse transcriptase?

C

14
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Which of these is the viral genome?

E

15

Double-stranded viral DNA is incorporated into a host cell as a _____.

provirus

16

How does HIV cause disease?

HIV kills cells that defend the body against disease.

17

How do enveloped viruses differ from nonenveloped viruses?

They have a membrane-like outer covering.

18

Which replicative cycle describes a virus that can integrate its genome into the host cell's genome?

Lysogenic

19

Which enzyme inserts viral DNA into the host's chromosomal DNA?

Integrase

20

How does HIV bind to a host cell?

The viral envelope proteins interact with CD4 and a co-receptor on the cell membrane.

21

Which of the following events stimulates the production of viral particles in a host cell?

Activation of the host cell by cytokines, growth factors, or antigens.

22

True or false? The human immunodeficiency virus (HIV) uses reverse transcriptase to make double-stranded RNA copies of its DNA

False