Phosphofructokinase is regulated by a number of factors, including high levels of ATP. Why is this enzyme regulated by ATP levels?
A. If ATP levels are high, this provides a mechanism to directly inhibit the Krebs cycle, thus preventing further generation of NADH, FADH2 and ATP molecules that are not needed.
B. If ATP levels are high, it is important to directly inhibit the reaction that commits the substrate to glycolysis to allow the substrate to be available for other reactions, since the cell has ample energy.
C. If ATP levels are high, it is important to inhibit ATP synthase, and phosphofructokinase directly inhibits ATP synthase.
D. If ATP levels are high, this provides a mechanism to directly inhibit the electron transport chain, thus preventing the formation of a proton gradient in the intermembrane space of mitochondria.
B. If ATP levels are high, it is important to directly inhibit the reaction that commits the substrate to glycolysis to allow the substrate to be available for other reactions, since the cell has ample energy.
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Fill in the blank(s) with the appropriate word(s).
The lymph vascular system begins at
a. the heart. b. the veins. c. the arteries. d. the arterioles. e. the capillaries.
In plants, ovaries develop into:a
seeds. b. fruits. c. corolla. d. calyx. e. bracts
A nerve impulse moves along a neuron as:
a. sodium moves into the cell and potassium moves out of the cell. b. sodium binds to potassium. c. sodium and potassium are pulled apart. d. acetylcholine moves along the nerve fiber. e. calcium exits the dendrites.