How is active immunity different from passive immunity?
a. Active immunity is slower in onset and shorter-lived.
b. Active immunity is slower in onset and longer-lived.
c. Active immunity is faster in onset and shorter-lived.
d. Active immunity is faster in onset and longer-lived.
e. Only active immunity involves antibodies.
ANSWER: b
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RNA molecules are transported from the nucleus to the cytoplasm in eukaryotes through:
A. sodium/potassium channels. B. aquaporins. C. passive diffusion. D. budding off of the nuclear envelope. E. nuclear pore complexes.
A single atom of carbon may form up to ____ covalent bonds with other atoms
a. two b. three c. four d. five e. six
Selective toxicity exhibited by a drug means that
A. the drug kills some organisms but not others. B. the drug is effective against the target organism, but not the human host. C. the drug is effective against gram-positive bacteria but not gram-negative. D. the drug is toxic to the human host but ineffective against the organism.
The term _________ refers to the alternating surges of pressure in an artery that occur with each contraction and relaxation of the left ventricle.
a. diastole b. murmur c. pulse d. systole