The ability to smell ____
a. manifests as a 1:1 relationship between an odor and a specific receptor
b. specific chemicals can indicate a possible reaction to a chemically related drug
c. specific chemicals will predict the effectiveness of antidepressants
d. is mediated by a family of about 400 genes
e. is mediated by the synthesis of olfactory receptors in the brain
d
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Which of the following is one of the four
defining characteristics of adaptive immunity?
a. specificity b. diversity c. memory d. self/nonself recognition e. all of these are defining characteristics of adaptive immunity
What type of protein is PTEN, which is mutated in 50% of prostate cancers?
A) kinase B) phosphatase C) growth factor receptor D) G protein E) ubiquitin ligase
What is the advantage of excreting nitrogenous waste in the form of ammonia?
A) Ammonia is less toxic than uric acid. B) Ammonia is less soluble than uric acid. C) Ammonia excretion conserves energy. D) Ammonia does not diffuse across cell membranes.
Nonpathogenic Vibrio cholerae can acquire the cholera toxin gene by
A) phagocytosis. B) transduction. C) conjugation. D) transformation. E) infecting a pathogenic Vibrio cholerae.