The effects of nerve gas prevent the removal of acetylcholine from synapses by interfering with its ____
a. diffusion away from the synaptic cleft
b. enzymatic degradation
c. active pumping back into the neuron
d. binding to its respective receptor
e. ability to flux ions across the membrane of the receiving neuron
ANSWER: b
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Precancerous cervical cells can be detected by
a. routine Pap smears. b. self-examination. c. a series of blood tests. d. x-ray examinations. e. ultra-sound
An incompletely dominant gene controls the color of
chickens so that BB produces black, Bb produces a slate-gray color called blue, and bb produces splashed white. A second gene controls comb shape, with the dominant gene R producing a rose comb and r producing a single comb. If a pure-breeding, black chicken with a rose comb is mated to a splashedwhite chicken with a single comb in the F2 generation, what fraction of the offspring will be blue with rose comb? a. 9/16 b. 3/8 c. 3/16 d. 1/8 e. 1/16
Which of the following is an example of an organ
that is nervous in origin, structure, and function but releases substances into the bloodstream? a. anterior pituitary b. posterior pituitary c. pancreas d. adrenal cortex e. testis
Successful cotransformation in the yeast two-hybrid system will result in the binding of proteins produced by each yeast expression vector. These fusion proteins function by
A) binding to the lacZ operator, preventing transcription. B) binding to RNA polymerase, preventing transcription. C) binding to the lacZ repressor, enabling transcription. D) binding to the lacZ upstream activator sequence, enabling transcription. E) changing color in the presence of X-gal.