What is the function of the ? subunit of E. coli RNA polymerase in transcription?
A. It contains the polymerase active site.
B. It contains the separate exonuclease site required for proofreading.
C. It directs the polymerase to bind a specific type of promoter sequence.
D. It signals the polymerase to terminate transcription at specific sites.
E. It allows template-independent RNA synthesis.
C
You might also like to view...
DNA repair:
A. can fix chromosomal inversions and translocations. B. can involve excision of bases flanking a distortion in the helix. C. always prevents errors. D. involves a set of proteins that are always active. E. is only active during DNA replication.
As observed in animal stem cells, plant stem cells are able to
A. exist as mature cells. B. produce nutrients for other cells. C. remain undifferentiated but can divide to produce cells that generate new tissues. D. fight microbial invaders by becoming mobile and phagocytic.
What is the approximate Q10 value for most enzymes?
A. 0.2 B. 2 C. 5 D. 10 E. 20
One of the generalizations of cell theory is that ____
a. all living organisms are made up of cells b. all cells divide by meiosis c. all cells have a nucleus d. cells arise through spontaneous generation e. growth is solely the result of cell division