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.
Structure of a DNA polymerase polypeptide that contains a 3'–5' proofread
The polymerase chain reaction (PCR).
Principles of amplification of selected fragments of DNA by polymerase chain reaction cycling.
DNA substrates that can be acted upon by purified DNA polymerase
Comparison of DNA polymerase structures with primer and template bound
The central nervous system is composed of the brain and the spinal cord