The SOS regulatory system is activated by
A) the activity of DNA polymerase IV.
B) DNA damage.
C) transcription of LexA.
D) repression of RecA.
Answer: B
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Hyperpolarization of a neuron causes the membrane potential to become _______ negative and is largely responsible for the _______ refractory period.
A. less/absolute B. less/relative C. more/absolute D. more/relative
Which of the following is an accurate description of climate patterns that result from supercontinent cycles?
A. Climate is generally cooler and drier at the margins of supercontinents compared to the interior. B. During the Mesozoic, Gondwana passed over the South Pole and experienced extensive glaciation. C. Temperature extremes were common in the interior of Pangaea at end-Permian due to its massive size. D. Supercontinental breakup can cause global warming, suggested by the breakup of Rodinia at the end of the Proterozoic.
What muscle is found on the anterior thigh and is a hip flexor/knee extensor?
Which of the following is the conversion of ammonium ion+ into nitrogen gas (N2)?
A) assimilation B) anammox C) nitrogen fixation D) nitrification E) denitrification