Cro Is a Bacteriophage λ Protein That Represses Transcription of CI

question 243

Multiple Choice

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

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