Which of the following bridges the gap between a
neuron sending a message and the neuron receiving
it?
a. threshold value
b. action potential
c. transmitter molecules
d. a neurohormone
e. all of these
Answer: c
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A. amino acid residue extracts H+ from 3' hydroxyl of deoxyribose. B. oxygen of 3' hydroxyl attacks ? phosphoryl group of nucleoside triphosphate. C. phosphate is displaced and protonated by an acidic amino acid residue. D. hydrogen bonds between DNA strands help position nucleotides. E. metal ions lower pKa within the active site to facilitate base catalysis.
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Facilitated transport requires the use of ATP.
a. true b. false
How does the rate of initiation of transcription relate to the similarity of the promoter region to the consensus sequence?
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