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Virus Structure and Replication Quiz

#1

Which of the following is NOT a component of a virus?

Ribosomes
Explanation

Ribosomes are cellular structures and not part of a virus.

#2

What is the primary function of the protein coat of a virus?

To protect the virus from the host's immune system
Explanation

The protein coat (capsid) provides protection and recognition, aiding in immune evasion.

#3

Which of the following viruses is known to cause the common cold?

Rhinovirus
Explanation

Rhinovirus is a common cause of the common cold in humans.

#4

Which of the following is a method by which viruses can enter host cells?

Endocytosis
Explanation

Endocytosis is a common mechanism for viruses to enter host cells.

#5

What is a bacteriophage?

A virus that infects bacteria
Explanation

Bacteriophages are viruses that infect and replicate within bacteria.

#6

Which of the following enzymes is essential for reverse transcription in retroviruses?

Reverse transcriptase
Explanation

Reverse transcriptase is crucial for synthesizing DNA from viral RNA in retroviral replication.

#7

What is the purpose of the envelope in some viruses?

To aid in attachment to host cells
Explanation

The envelope helps viruses attach to host cells, facilitating entry.

#8

Which of the following is a feature of the lytic cycle in viral replication?

Lysis of the host cell to release virions
Explanation

The lytic cycle ends with the host cell bursting, releasing newly formed viruses.

#9

What is the role of viral RNA polymerase in the replication of RNA viruses?

Replication of viral RNA genome
Explanation

Viral RNA polymerase synthesizes RNA copies of the viral genome.

#10

What is the function of the capsid in a virus?

To package and protect the viral genome
Explanation

The capsid encloses and protects the viral genetic material during transmission.

#11

Which of the following is a characteristic feature of RNA viruses?

Mutation-prone replication
Explanation

RNA viruses exhibit high mutation rates during replication.

#12

What is a viroid?

A small infectious RNA molecule
Explanation

Viroids are small, infectious RNA molecules lacking a protein coat.

#13

Which of the following is a characteristic feature of prions?

Infectious proteins
Explanation

Prions are misfolded proteins with the ability to induce misfolding in normal proteins.

#14

Which of the following is a characteristic of retroviruses?

Integration of viral DNA into the host genome
Explanation

Retroviruses integrate their RNA genome into the host DNA during replication.

#15

What is the mechanism of action of neuraminidase inhibitors in treating influenza?

Preventing release of viral progeny from infected cells
Explanation

Neuraminidase inhibitors block the release of new influenza virus particles from infected cells.

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