The virus repressor protein
A) controls the prophage's lytic genes but not the incoming genomes of the same virus.
B) does not control the prophage's lytic genes but does control the incoming genomes of the same virus.
C) controls both the lytic genes on the prophage and prevents an incoming virus of the same type.
D) has different actions in different situations.
Answer: C
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A) aerobic catabolism B) anaerobic C) chemoorganotrophy D) photoautrophy
Methanogens can live only in ________ environments.
A. microaerophilic B. aerobic C. anaerobic D. All of the choices are correct.
Any change in allele frequencies in a gene pool
is
a. natural selection. b. macroevolution. c. microevolution. d. mutation. e. artificial selection
Some drugs modulate the activity of ion channels. For example, Novocain somewhat inhibits the opening of sodium channels. What happens to the threshold of a sensory neuron if this drug is used?
A) It will take less stimulation to reach threshold. B) The nerve will not function and will die off. C) Threshold will not change. D) It will take more stimulation to reach threshold.