Cro is a bacteriophage λ protein that represses transcription of cI but promotes expression of genes that encourage the lytic cycle.cI protein represses Cro transcription but promotes expression of genes that encourage lysogeny.If the environment experienced by bacteriophage λ deteriorates, the change will most likely _______ the lifespan of cI protein.This result will have the effect of _______.
A) increase; maintaining lysogeny
B) increase; increasing the production of capsid proteins
C) increase; making entry into the lytic phase more likely
D) decrease; maintaining lysogeny
E) decrease; making entry into the lytic phase more likely

Question

Quizplus · Accepted Answer

When the environment deteriorates, bacteriophage λ is more likely to enter the lytic cycle to ensure its survival by producing more viruses. This involves decreasing the lifespan of the cI repressor protein, which promotes lysogeny, thereby making entry into the lytic phase more likely.

Cro Is a Bacteriophage λ Protein That Represses Transcription of CI