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.
Dominant interactions between hemoglobin subunits
Principles of amplification of selected fragments of DNA by polymerase chain reaction cycling.
The DNA polymerase reaction
Conserved sequences in promoters recognized by E. coli RNA polymerase
In the polymerase chain reaction (PCR)
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