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.
Enzymatic features of DNA polymerase that account for its inability to copy one of the DNA strands a
DNA Polymerase Binds to the Template Strand.
Electronmicrograph showing a blood clot composed of fibrin, red blood cells, and tissue debris.
In dihedral symmetry, all subunits can be related by rotation
The ribosomes themselves are composed of RNA strands.
The primase-polymerase switch during lagging strand synthesis