When damaged or single-stranded DNA activates the RecA protein, the RecA protein stimulates the cleavage of LexA. This results in
A) repression of polymerase V and activation of endonuclease.
B) activation of the Hfr system.
C) derepression of the SOS system.
D) increased transduction and recombination.
Answer: C
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Osmoreceptors help the body deal with dehydration in part by stimulating release of ____
a. atrial natriuretic factor b. renin c. aldosterone d. antidiuretic hormone e. angiotensin
Why do cells go through fermentation?
a. to replenish ADP b. to replenish NADH c. to replenish FAD d. to replenish O2 e. to replenish NAD+
PhyB may inhibit flowering in:
a. day-neutral plants. b. vernalized plants. c. long-day plants. d. senescing plants. e. short-day plants.
Which pair is NOT matched correctly?
a. plant cell wall : cellulose b. intermediate filaments : tubulin c. microfilaments : actin d. cell membrane : phospholipid bilayer