A drug that specifically inhibits voltage-gated calcium channels would most directly inhibit
A) depolarization of nerve cell membranes.
B) repolarization after depolarization of nerve cell membranes.
C) hyperpolarization of nerve cell membranes.
D) presynaptic neurotransmitter release.
E) postsynaptic receptor signal response.
Answer: D
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A deletion was engineered into the coding sequence of DnaK of Escherichia coli. This mutation would most likely result in:
A. an increase of heat shock proteins. B. an increase in DnaJ. C. a temperature-sensitive bacteria. D. a temperature-resistant bacteria. E. a result that cannot be determined.
Living at high altitudes can cause ____ as a respiratory adaptation
a. elevated erythrocyte count b. decreased number of alveoli c. decreased number of lung capillaries d. hemoglobin molecules with less affinity for O2 e. decreased erythrocyte count
The mother of these progeny resulted from a cross between two flies from true-breeding lines. What are the genotypes of these two lines?
In Drosophila, the autosomal recessive pr and cn mutations cause brown and bright-red eyes, respectively (wild-type flies have brick-red eyes). Flies who are homozygous recessive at both pr and cn have orange eyes. A female who has wild-type eyes is crossed to an orange-eyed male. Their progeny have the following distribution of eye colors:
A) pr cn+ / pr cn+ and pr+cn / pr+cn
B) pr+cn+ / pr+cn+ and pr cn / pr cn
C) pr+cn+ / pr cn and pr cn / pr cn
D) pr+cn / pr cn and pr cn+ / pr cn
E) More than one of these could be true.
In the Watson-Crick model of DNA structure, the polynucleotide chains are
A. of unequal length. B. both oriented in the same direction. C. arranged with the bases on the outside. D. built with the nucleotides as the backbone. E. oriented in opposite directions.