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Based on Figure 19

Question 181

Multiple Choice

Based on Figure 19.21, below, which of the following is NOT an accurate description of events leading to the lysogenic pathway following viral infection in a bacterium? Based on Figure 19.21, below, which of the following is NOT an accurate description of events leading to the lysogenic pathway following viral infection in a bacterium?   A) Upon infection, transcription is initiated at promoters P<sub>L</sub> and P<sub>R</sub>. The transcripts from P<sub>R</sub> encode the proteins cro and cII. B) Reduction in the concentration of cI protein is the most important contributor to lysogeny. C) Reduced protease activity due to poor conditions allows cII to accumulate, which then stimulates transcription from P<sub>E</sub> and thus expression of cI. D) cI protein binds to operator O<sub>R</sub>, preventing cro and cII expression. E) cI protein stimulates transcription from promoter P<sub>M</sub>, leading to even more cI production. The increased cI binds to operator O<sub>L</sub><sub> </sub>and inhibits P<sub>L</sub>.


A) Upon infection, transcription is initiated at promoters PL and PR. The transcripts from PR encode the proteins cro and cII.
B) Reduction in the concentration of cI protein is the most important contributor to lysogeny.
C) Reduced protease activity due to poor conditions allows cII to accumulate, which then stimulates transcription from PE and thus expression of cI.
D) cI protein binds to operator OR, preventing cro and cII expression.
E) cI protein stimulates transcription from promoter PM, leading to even more cI production. The increased cI binds to operator OL and inhibits PL.

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