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.
Prokaryote v. Eukaryote (Plant vs. Animal Cells)
he vertebrate stomach as an example of an organ composed of all four tissue types
The ribosomes themselves are composed of RNA strands.
Ribosomal subunits
The chemical reaction catalyzed by DNA polymerase I
Escherichia coli RNA Polymerase Sigma Subunits