In a given bacterium,transcription of housekeeping genes is normal,but genes involved in nitrogen metabolism,stress,and chemotaxis are disrupted.Which sigma subunit is intact?
A)σ²⁸
B)σ³²
C)σ³⁵
D)σ⁵⁴
E)σ⁷⁰

Question

Quizplus · Accepted Answer

Sigma subunit σ⁷⁰ is responsible for transcription of housekeeping genes, which are essential for the basic functions of the cell. The fact that transcription of these genes is normal in the given bacterium suggests that σ⁷⁰ is intact. Genes involved in nitrogen metabolism, stress, and chemotaxis are regulated by different sigma subunits, which have more specific roles. Their disruption suggests that the respective sigma subunits are not functioning properly. Therefore, the best choice is E) σ⁷⁰.

In a Given Bacterium,transcription of Housekeeping Genes Is Normal,but Genes