Ion channels are _____ in the plasma membrane that allow _____ to pass through
glycoproteins; ions
phospholipids; cholesterol
ions; proteins
proteins; ions
D. proteins; ions
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Sulfonamides and other drugs that inhibit folic acid synthesis have a high therapeutic index because
A. humans synthesize folic acid by a process that is not sensitive to sulfonamides. B. humans do not use folic acid. C. humans do not synthesize folic acid but obtain it in their diets. D. None of these are correct.
Respiratory proteins such as __________ in red
blood cells and __________ in muscle bind oxygen and help maintain gradients that favor gas exchange. Fill in the blank(s) with the appropriate word(s).
The lowest temperature at which a microbe continues to metabolize is called its ____.
Fill in the blank(s) with the appropriate word(s).
The major function of cAMP in animal cells is to activate
a. adenylyl cyclase. b. protein kinase A. c. protein kinase C. d. tyrosine kinases.