RNA Polymerase in a Prokaryote Is Composed of Several Subunits

question 32

Multiple Choice

RNA polymerase in a prokaryote is composed of several subunits. Most of these subunits are the same for the transcription of any gene, but one, known as sigma, varies considerably. Which of the following is the most probable advantage for the organism of such sigma switching?

• A) It might allow the transcription process to vary from one cell to another.
• B) It might allow the polymerase to recognize different promoters under certain environmental conditions.
• C) It could allow the polymerase to react differently to each stop codon.
• D) It could allow ribosomal subunits to assemble at faster rates.
• E) It could alter the rate of translation and of exon splicing.

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Definitions:

Variables

Represents elements, features, or factors that are liable to vary or change.

Conceptually Replicated

Refers to a research study or experiment that has been repeated using different methods or measures but produces similar findings that support the original hypothesis.

Conceptual Variables

Abstract elements within theories that cannot be directly observed but are instead measured through operational definitions.

External Validated

The confirmation or endorsement from external sources that someone's feelings, opinions, or internal states are reasonable or valid.