ATP formation in the electron transport system is called ________.
A. oxidative phosphorylation
B. substrate level phosphorylation
C. direct phosphorylation
D. Both substrate level phosphorylation and direct phosphorylation are correct.
Answer: A
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Beta receptors
A) are especially sensitive to epinephrine and relatively unresponsive to norepinephrine. B) may produce inhibition only. C) cause constriction of blood vessels in skeletal muscles. D) respond by opening ion channels that hyperpolarize the plasmalemma in heart muscle cells. E) may produce excitation only.
The three pairs of muscles attached to the outside of the eyeball that are used for eye movement are called ________ muscles.
A. extrinsic B. intrinsic
Vitamin D can be produced by the ____________________ upon exposure to sunlight
Fill in the blank(s) with correct word
The first part of the small intestine is called the ____
a. jejunum b. duodenum c. ileum d. fundus