An antimicrobial's therapeutic index is
A) The drug level required for clinical treatment of an infection
B) The drug level at which the agent becomes too toxic for the host
C) The ratio of the toxic dose to the therapeutic dose
D) The level of effectiveness in a population
Answer: B) The drug level at which the agent becomes too toxic for the host
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Why do histone genes have the slowest molecular clock?
A. The structure of the histone gene must be conserved for DNA to function properly. B. Histone genes simply do not have the same rate of mutations. C. DNA-correcting mechanisms function more readily with histone genes. D. Cells have more histone genes than any other kind of gene. E. Histone genes normally have selfcorrecting mechanisms.
Which of the following secretions is NOT found in the duodenum?
a. pancreatic fat digesting enzymes b. bile c. gastrin d. bicarbonate e. pancreatic protein digesting enzymes
Friedrich Miescher, after he began to study the chemical composition of the nucleus, was one of the first to ____
a. propose the nuclear structure of the H5N1 virus b. discover that the nucleus contained DNA but no proteins c. discover that human and mice chromosome chemistry differs greatly d. isolate DNA and propose its structure e. isolate and purify a cellular organelle
What type of transport uses two transport proteins?
a. Uniport b. Antiport c. Symport d. None of the proteins do e. All of the proteins do