David Pribnow Studied the Base Sequences of Promoters in Bacteria

question 18

Multiple Choice

David Pribnow studied the base sequences of promoters in bacteria and bacterial viruses.He found two conserved regions in these promoters (the -10 box and the -35 box) .What is the function of these two regions of the promoter?

• A)They signal the initiation site.
• B)They bind the sigma subunit that is associated with RNA polymerase.
• C)They attach the correct nucleotide triphosphate to the template DNA strand.
• D)They separate the two DNA strands.

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Definitions:

Stem Cells

Undifferentiated cells with the potential to develop into many different cell types in the body, serving as a repair system for tissues.

Glands

Organs in the body that secrete hormones or other substances directly into the blood or onto a surface within or outside the body.

Neurons

are the basic working units of the brain, specialized cells that transmit information to other nerve cells, muscle, or gland cells.

Sex Hormones

Hormones that regulate the development and functioning of reproductive organs and that stimulate the development of male and female sexual characteristics; they include androgens, estrogens, and progesterone.