Which pollutant would most likely be the source of coliform bacteria in a stream?
a. fertilizers from a golf course.
b. discharge from a factory.
c. forestry activities.
d. sewage or animal wastes.
b
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In bacterial synthesis of polysaccharides, such as starch and glycogen, glucose is donated to the end of the growing chain by ADP-glucose. A similar reaction occurs in bacterial branching of phospholipids when phosphatidic acid is attached to a ________.
A. dihydroxyacetone phosphate B. fatty acyl-ATP C. acetyl-CoA D. cytidine diphosphate carrier
A mutation that changes a codon sequence, and subsequently changes the amino acid that should have been placed at that point in the polypeptide chain, is a
A) frameshift mutation. B) missense mutation. C) silent mutation. D) nonsense mutation.
Which of the following statements regarding the cell-mediated immune response is TRUE?
A) Cytotoxic T lymphocytes do not require antigen presentation to become activated. B) Cytotoxic T lymphocytes interact with antibodies that have bound antigen to identify their target. C) Helper T lymphocytes have no role in the activation of cytotoxic T lymphocytes. D) Cytotoxic T lymphocytes kill by producing hydrogen peroxide. E) A single cytotoxic T lymphocyte can kill many target cells.
If the fossil records of apes and humans alike show a trend toward decreasing larynx size in adult females, and increasing larynx size in adult males, then
A) sexual dimorphism was developing over time in these species. B) intrasexual selection seems to have occurred. C) the ?good genes? hypothesis was refuted by these data. D) stabilizing selection was occurring in these species concerning larynx size. E) selection was acting more directly upon genotype than upon phenotype.