The Nernst equation is used to calculate the ____
a. action potential
b. equilibrium potential
c. membrane potential of a neuron at rest c
d. membrane potential of a hyperpolarized neuron
e. membrane potential of a depolarized neuron
ANSWER: b
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In crustaceans, molting is stimulated by the hormone ________
a. estrogen b. ecdysone c. FSH d. TSH
Which structure is used for excretion and
reproduction? a. A b. B c. C d. D e. none of these
DNA repair in eukaryotes and prokaryotes
A) relies on DNA polymerases to correct all mutations. B) relies on completely different mechanisms. C) is accomplished by multiple specialized pathways. D) can only repair abnormal nucleotides such as pyridine dimers and depurinated bases. E) is very ineffective.
Frame-shift mutations:
A: only arise from deletions, not from insertions. B: almost always lead to loss of function. C: cause the ribosome to misread DNA. D: result in a single amino acid substitution. E: result from a deletion of three nucleotides.