Why Does E.coli Have Several Different Sigma Factors

question 23

Multiple Choice

Why does E.coli have several different sigma factors?

• A)They allow different RNA polymerases to bind to the promoters.
• B)They allow the different subunits of the RNA polymerase holoenzyme to bind to each other.
• C)There is no good reason.They all perform the same function.
• D)One is needed to transcribe mRNA.A second is needed to transcribe tRNA.And a third is needed to transcribe rRNA.
• E)They allow RNA polymerase to recognize and bind to a different subset of promoters.

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Definitions:

Character Displacement

As a result of competition, two species become less similar in their resource requirements.

Mutualism

Species interaction that benefits both species.

Colonists

Individuals or groups who settle in a new area or country, often establishing control or cultivating it for the first time.

Extinct

Refers to a species that no longer has living members.