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Questions 1
Questions 2
Question 3
Question 4
Question 5
100


The component(s) of a virus that is/are extended from the envelope for attachment is/are the:

  1. capsomeres
  2. spikes
  3. nucleic acid
  4. viral whiskers

B. Spikes

100

Which of the following leads to the destruction of the host cells?

  1. lysogenic cycle
  2. lytic cycle
  3. prophage
  4. temperate phage

B. lytic cycle

100

11. Which of the followings cannot be used to culture viruses?

  1. tissue culture
  2. liquid medium only
  3. embryo
  4. animal host

B. liquid medium only

100

A virus can infect every type of host cell such as animals, plants, fungi, protists, and bacteria.

a.False

b.True

False

100

The first virus discovered by scientists was ______.

a.influenza B

b.smallpox

c.tobacco mosaic virus

d.tobacco mosaic disease (TMD)

e.Ebola

C. tobacco mosaic virus

200

2.

Which of the following does a virus lack? Select all that apply.

  1. ribosomes
  2. metabolic processes
  3. nucleic acid
  4. glycoprotein

A. ribosomes and B. metabolic processes

200

7. A virus obtains its envelope during which of the following phases?

  1. attachment
  2. penetration
  3. assembly
  4. release

D. release

200

12.Which of the following tests can be used to detect the presence of a specific virus?

  1. EIA
  2. RT-PCR
  3. PCR
  4. all of the above

D. all of the above

200

An acellular entity composed of a small circular RNA molecule without a capsid and is not capable of replicating its genome is known as which of the following?

a.viroid

b.virion

c.virusoid

d.provirus

C. virusoid

200

The protein subunits that surround the nucleic acid of a virus are known as which of the following?

a.amino acids

b.chromatins

c.capsomeres

d.telomeres

capsomeres

300

3. The envelope of a virus is derived from the host’s

  1. nucleic acids
  2. membrane structures
  3. cytoplasm
  4. genome

B. Membrane structures

300

8. Which of the following components is brought into a cell by HIV?

  1. a DNA-dependent DNA polymerase
  2. RNA polymerase
  3. ribosome
  4. reverse transcriptase

D. reverse transcriptase

300

13. Which of the following is NOT a cytopathic effect?

  1. transformation
  2. cell fusion
  3. mononucleated cell
  4. inclusion bodies

C. mononucleated cell

300

Arthropods carrying viruses inside the body serve as which mechanism of transmission for viruses?

a.both as fomites and as vectors

b.biological vector

c.fomite

d.mechanical vector

b. Biological vector

300

Transmissible spongiform encephalopathies, such as Creutzfeldt-Jakob disease, are caused by which of the following?

a.bacterium

b.viroid

c.prion

d.fungus

e.virus

C. Prion

400

4.

In naming viruses, the family name ends with ________ and genus name ends with _________.

  1. −virus; −viridae
  2. −viridae; −virus
  3. −virion; virus
  4. −virus; virion

B. -viridae; -virus

400

9. A positive-strand RNA virus:

  1. must first be converted to a mRNA before it can be translated.
  2. can be used directly to translate viral proteins.
  3. will be degraded by host enzymes.
  4. is not recognized by host ribosomes.

B. can be used directly to translate viral proteins

400

14. Which of these infectious agents do not have nucleic acid?

  1. viroids
  2. viruses
  3. bacteria
  4. prions

C. Bacteria

400

Clostridium botulinum may become pathogenic and produce botulinum neurotoxin with the integration of ______.

a.viroid

b.provirus

c.prophage

d.virion

C. Prophage

400

Which mechanism of horizontal gene transfer relies on the use of viruses?

a.mutation

b.transduction

c.conjugation

d.transformation

B.transduction

500

What is another name for a nonenveloped virus?

  1. enveloped virus
  2. provirus
  3. naked virus
  4. latent virus

C. naked virus

500

10. What is the name for the transfer of genetic information from one bacterium to another bacterium by a phage?

  1. transduction
  2. penetration
  3. excision
  4. translation

A. transduction

500

15.

Which of the following is true of prions?

  1. They can be inactivated by boiling at 100 °C.
  2. They contain a capsid.
  3. They are a rogue form of protein, PrP.
  4. They can be reliably inactivated by an autoclave.

C. They are a rogue from of protein, PrP.

500

In retroviruses, the integrated phage genome is known as which of the following?

a.virion

b.prophage

c.provirus

d.viroid

e.prions

C. provirus

500

Which of the following is a novel enzyme found in retroviruses?

a.Taq polymerase

b.retrotransciptase

c.forward transcriptase

d.reverse transcriptase

D. reverse transcriptase