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T4 Genes Are Transcribed by Host RNA Polymerase, Yet This

Question 22

Multiple Choice

T4 genes are transcribed by host RNA polymerase, yet this transcription is carefully controlled so that groups of T4 genes are transcribed in a specific order after infection. How is this accomplished?


A) Early T4 genes encode for proteolytic enzymes that destroy the host RNA polymerase. Subsequently a viral polymerase is created that transcribes the middle and late genes in the correct order.
B) Early and middle T4 genes encode for RNA polymerase-modifying proteins so that only phage promoters are recognized.
C) Each group of T4 genes has a different promoter that indicates the order in which they should be transcribed based on the affinity of the promoter for the host RNA polymerase.
D) Rolling circle replication of the viral genome ensures that the genes are available for transcription in the correct order.

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