Which of the following is NOT a function of proteins?
A. They form hemoglobin to transport oxygen in the blood.
B. They form the backbone of cell membranes.
C. They form enzymes to speed up reactions.
D. They form antibodies to protect the body from disease.
Answer: B
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Unique molecules found on the outer surface of cell membranes are called ________
A) Antigens B) Interferon C) Antibodies D) Cytokines
Renal compensation to a decrease in blood H+ levels is to increase the activity of type
A. A cells to secrete more bicarbonate. B. A cells to secrete less bicarbonate. C. B cells to secrete more bicarbonate. D. B cells to secrete less bicarbonate.
The first electron shell of an atom can hold a maximum of
A) 1 electron. B) 4 electrons. C) 8 electrons. D) 2 electrons.
Which of the following is a molecule that binds to a receptor?
A) acetylcholine B) tropomyosin C) acetylcholinesterase D) all of the above