The sodium-potassium pump
a. helps establish an electrochemical gradient across the membrane.
b. concentrates sodium on the outside of the membrane.
c. uses a carrier protein and chemical energy.
d. is present in the plasma membrane.
e. All of these are correct.
e. All of these are correct.
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DNA contains an organism's genetic material, organized into sequences called:
a. genes. b. chromosomes. c. gametes. d. nuclei. e. sperm and egg cells.
Troponin and tropomyosin regulate:a
calcium storage and release. b. actin and myosin interactions. c. action potential transmission. d. acetylcholine storage and release. e. rate of muscle fiber division.
The removal of electrons and/or hydrogen atoms from a substrate is called what?
a. phosphorylation b. an enzyme-substrate complex c. metabolism d. oxidation e. reduction
The chromosomes line up in the middle of the cell during
A. prophase. B. anaphase. C. metaphase. D. telophase. E. prophase II.