The final electron acceptor associated with photosystem I is _____
A) oxygen
B) water
C) NADP
D) NADPH
C
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The primary function of an enzyme or any biological catalyst is to
A. reduce the energy of activation of a reaction. B. increase the rate of a reaction. C. change the direction of a reaction. D. reduced the energy of activation and increase the rate of a reaction. E. increase the rate of a reaction and change the direction of a reaction.
Atherosclerosis
a. decreases the size of the lumen of arteries. b. effects the diameter of veins. c. has no effect on the size of the lumen of arteries. d. increases the size of the lumen of arteries. e. presents many clinical symptoms immediately.
Nitrogen-fixing bacteria convert ____ to ____, which is a form of nitrogen that plants can use
a. nitrogen gas; ammonia b. ammonia; nitrogen gas c. nitrogen gas; nitrates
d. nitrogen gas; nitrites e. ammonia; nitrates
Steroid and thyroid hormones do not bind to membrane surface receptors because they ____
a. are small enough to pass directly through the membrane b. are soluble in the lipid bilayer c. pass through special membrane channels d. are water-soluble e. dissolve in the cholesterol present in cell membranes