What is the result of calcium flow through NMDA receptors in a synapse where little glutamate has been released from the presynaptic terminal?
a. NMDA receptors are removed from the postsynaptic terminal.
b. NMDA receptors are added to the postsynaptic terminal.
c. AMPA receptors are removed from the postsynaptic terminal.
d. AMPA receptors are added to the postsynaptic terminal.
c. AMPA receptors are removed from the postsynaptic terminal.
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A nasopharyngeal aspirate is cultured on Bordet-Gengou agar, and growth is observed. The colonies are also subjected to a direct fluorescent antibody (DFA) stain, which is also positive. On the basis of these findings, the antimicrobial therapy that should be administered to the pa-tient is:
a. azithromycin. b. gentamycin. c. streptomycin. d. imipenem.
Yeast produce ethanol, a toxic waste product during fermentation. Why would yeast undergo fermentation instead of cellular respiration?
A. to regenerate NAD+ in order to continue glycolysis B. to use up excess pyruvate in order to continue glycolysis C. to avoid the production of lactic acid D. to produce NADH for energy E. to conserve oxygen for other reactions
For the same sample, the 95% confidence interval will have what relation to the 99% confidence interval?
A. It will be smaller. B. It will be larger. C. They will not overlap. D. They will be exact complements of each other.
Due to character displacement, two closely related species may differ most morphologically when they
A. are allopatric. B. are sympatric. C. occupy the same niche. D. occupy different niches. E. share a common ancestor.