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Virus Quiz

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Questions and Answers

Which of the following is a unique characteristic of viruses?

Large size (over 1 micrometer)

Ability to replicate without a host cell

Protein coat surrounding genetic material (correct)

Cellular structure and metabolism

What is the function of the capsid in a virus?

To recognize and attach to host cell receptors

To provide shape and structural integrity (correct)

To carry the necessary instructions for replication

To release newly formed viruses

Which type of symmetry is exhibited by the Adenovirus?

Icosahedral symmetry (correct)

No specific symmetry

Helical symmetry

Complex structure

What happens during the replication stage of the lytic cycle?

The virus injects its genetic material into the host cell (D) Signup and view all the answers

What is the role of the envelope in some viruses?

To protect the viral genetic material (B) Signup and view all the answers

Which cycle involves the viral DNA integrating into the host cell genome?

Lysogenic cycle (B) Signup and view all the answers

What happens during the release stage of the lytic cycle?

The host cell is lysed and new viral particles are released (B) Signup and view all the answers

Which event triggers the prophage to become active?

Environmental cues (B) Signup and view all the answers

What happens when the prophage is excised from the host genome?

It initiates the lytic cycle (D) Signup and view all the answers

Which hypothesis suggests that viruses originated from fragments of cellular genetic material?

Escape Hypothesis (D) Signup and view all the answers

According to the Regressive Hypothesis, what did viruses originate from?

Parasitic cellular organisms (D) Signup and view all the answers

What is one of the implications of rapid evolution in viruses?

Antigenic drift (D) Signup and view all the answers

What is one of the challenges posed by rapid evolution for vaccination?

Antigenic drift (B) Signup and view all the answers

What is one of the ways viruses can undergo genetic recombination?

Multiple strains infecting the same host cell (A) Signup and view all the answers

What exerts selective pressure on viral variants?

All of the above (D) Signup and view all the answers