Coupled reactions are reactions in which an
A. exergonic reaction drives a spontaneous reaction.
B. exergonic or endergonic reaction provides products not used for other reactions.
C. exergonic reaction drives an endergonic reaction.
D. endergonic reaction drives a spontaneous reaction.
E. endergonic reaction drives an exergonic reaction.
C. exergonic reaction drives an endergonic reaction.
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Methane is usually released directly to the atmosphere in environments without an overlying ________ water zone.
Fill in the blank(s) with the appropriate word(s).
The outside of a neuron is positively charged at resting potential. Why do K+ ions leave the cell when K+ channels open during an action potential?
A. The diffusion gradient is the only factor that affects ion movement. B. K+ ions are actively pumped out by the sodium-potassium pump acting in reverse. C. Voltage-gated K+ channels open when membrane potential reaches +50 mV during the depolarization phase. The diffusion gradient and electrical force cooperate to drive K+ ions out of the cell. D. Negatively charged proteins leave the cell at the onset of the action potential.
In the breakdown of a molecule of glucose in the cytoplasm, ________ molecules of ATP are produced.
Fill in the blank(s) with the appropriate word(s).
Which of the following were the first vertebrates to truly thrive on land?
A. amphibians B. birds C. mammals D. reptiles E. fish