Course

Microbiology

Study Pack

Set 5 Single Stranded Rna Bacteriophages

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Question 1

(Multiple Choice)

Free
When an RNA phage virion is assembled with either a defective or missing maturation protein, which of the following occurs?

A) The viral RNA genome is more sensitive to RNAse degradation.
B) The virion is more sensitive to protease degradation.
C) The virion is unstable and disassembles easily in the environment.
D) The virion is not able to carry out genome replication.
E) The tail cannot inject the genome into the host cell.

Answer

Question 2

(Multiple Choice)

Free
In the ssRNA phage MS2, translation of the lysis protein gene is dependent on which of the following events?

A) Replication of the viral genomic RNA.
B) Initiation of translation of the replicase gene.
C) Binding of the coat protein to the nucleation site on the genome.
D) Termination of translation of the coat protein gene.
E) Initiation of translation of the maturation gene.

Answer

Question 3

(Multiple Choice)

Free
In the ssRNA phage MS2, the replicase protein binds to the start codon of the coat protein gene.Which of the following describes the reason for this binding?

A) It prevents replication and translation from occurring simultaneously.
B) It initiates synthesis of the minus-strand copy of the genome.
C) It enhances binding of the ribosome to the coat protein gene.
D) It disrupts the stem-loop structure that prevents replication of the viral genome.
E) It exposes the 3' end of the genome which allows the replicase to begin RNA synthesis.

Answer