Sigma (σ)Factors Can Regulate the Initiation of Transcription

question 39

Multiple Choice

Sigma (σ) factors can regulate the initiation of transcription.Which of the following is not an example of σ regulation?

• A)Some σ factors recognize promoters for genes whose products are necessary when the organism is under stress,such as heat shock.
• B)Some σ factors recognize promoters for genes whose products are necessary for nitrogen utilization.
• C)Bacteriophages may code for specific σ factors that bind the core RNA polymerase and result in recognition of viral promoters.
• D)Many σ factors regulate genes associated with embryonic development in eukaryotes.
• E)UV irradiation can trigger the use of alternative σ factors.

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