Question 1

Which of the following best describes a prophage?

Accepted Answer

Lysogenic viral DNA integrated into the host genome

Question 2

Which event is most likely to trigger induction of a temperate bacteriophage?

Accepted Answer

Exposure to UV light

Question 3

During which stage of the viral replication cycle is the host cell's DNA typically destroyed?

Accepted Answer

Biosynthesis

Question 4

What is the main difference between the lytic and lysogenic cycles of bacteriophage infection?

Accepted Answer

The viral DNA integrates into the host genome during the lysogenic cycle

Question 5

Which stage of the viral replication cycle involves the introduction of viral DNA into the host cell?

Accepted Answer

Penetration

Question 6

Formation of mature viruses occurs during which stage?

Accepted Answer

Assembly

Question 7

Which of the following is NOT a criterion used to classify viruses?

Accepted Answer

Biochemical tests

Question 8

A clear area against a confluent 'lawn' of bacteria is called a:

Accepted Answer

Plaque

Question 9

Which of the following is a feature found in viruses but never in bacteria?

Accepted Answer

May contain an RNA genome

Question 10

How are prions different from other infectious agents?

Accepted Answer

They lack nucleic acid

Question 11

Stanley Prusiner first identified prions as the cause of which disease?

Accepted Answer

Scrapie

Question 12

Which phrase is the term 'prions' derived from?

Accepted Answer

Proteinaceous infectious particles

Question 13

Which of the following is acquired during the release stage of viral replication?

Accepted Answer

A viral envelope

Question 14

Which of the following statements about continuous cell lines is TRUE?

Accepted Answer

Continuous cell lines can be maintained through an indefinite number of generations

Question 15

Which of the following is NOT a possible result of lysogeny?

Accepted Answer

Immunity to reinfection by any phage

Question 16

Shingles is an example of which type of viral infection?

Accepted Answer

Reactivation of latent virus

Question 17

Which of the following best explains why viruses require a host cell for reproduction?

Accepted Answer

They lack the necessary enzymes for independent metabolism

Question 18

What is the primary function of the structural elements of a virus?

Accepted Answer

To package and protect the viral genome

Question 19

Which of the following is TRUE regarding glycoprotein spikes on viruses?

Accepted Answer

They are not found on the capsids of all viruses

Question 20

An infectious protein is called a:

Accepted Answer

Prion

Viruses, Bacteriophages, and Prions: Structure, Replication, and Classification

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