Proteins are polymers of ____
a. amino acids
b. monosaccharides
c. steroids
d. nucleotides
e. phospholipids
ANSWER: a
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Infections by "flesh-eating bacteria" can occur when exotoxins A, B, C, and E and the bacterial surface M protein of Streptococcus pyogenes act as superantigens
Indicate whether the statement is true or false.
Of the following codons, which encodes a normal translational stop?
A) UUU B) AUG C) UAG D) AAA E) AGG
At puberty, an adolescent female body changes in both structure and function of several organ systems, primarily under the influence of changing concentrations of estrogens and other steroid hormones. How can one hormone, such as estrogen, mediate so many effects?
A) Estrogen is produced in very large concentration and therefore diffuses widely. B) Estrogen has specific receptors inside several cell types, but each cell responds in the same way to its binding. C) Estrogen is kept away from the surface of any cells not able to bind it at the surface. D) Estrogen binds to specific receptors inside many kinds of cells, each of which have different responses to its binding. E) The subcomponents of estrogen, when metabolized, can influence cell response.
The most sustainable method for limiting human population growth is ____
a. decreasing birth rate b. increasing carrying capacity c. decreasing competition d. increasing death rate
e. exploiting outer space