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.

Question

Quizplus · Accepted Answer

Sigma factors are specific to prokaryotes, primarily bacteria, and are involved in the initiation of transcription by enabling the RNA polymerase to recognize promoters. Eukaryotes, including organisms that undergo embryonic development, do not use sigma factors for transcription initiation but instead rely on a complex system of transcription factors and other regulatory mechanisms.

Sigma (σ)Factors Can Regulate the Initiation of Transcription