Because of the high requirement for reducing power in nitrogen fixation, the nitrogenase enzyme that carries out the reaction is very sensitive to the presence of ________.
A. oxygen
B. carbon dioxide
C. light
D. None of the choices are correct.
Answer: A
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Which one of the following is the function of horizontal cells in the eye?
A. They transmit signals from rods and cones to the optic nerve. B. They receive signals from multiple photoreceptors (rods and cones), integrating and regulating their input. C. They communicate between and among bipolar cells. D. They process of visual input to actually form an image.
Blood slows down in arterioles due to the large cross-sectional area.
a. true b. false
The membrane-bound enzyme system that restores and maintains the resting membrane potential is
which of the following pumps? a. sodium-phosphorus b. sodium-potassium c. sodium-chlorine d. phosphorus-calcium e. phosphorus-chlorine
Identify the purine from the list below:
A) cytosine B) thymine C) uracil D) guanine