An action potential occurs in the postsynaptic muscle cell when ____________________
a. acetylcholine binds to the receptors on the muscle cell
b. when calcium functions as a neurotransmitter
c. the sodium–potassium pump moves ions across the membrane
d. all of these
A
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Molecules are considered stereoisomers when:
A. they rotate plane-polarized light to the left only. B. they have the same chemical and structural formulas but the structures are not superimposable. C. they have three different groups bound to a central carbon. D. they have structures differing only by one group. E. they contain no chiral centers.
Which of the following are considered more
primitive based upon the structure of their limbs? a. bats b. reptiles c. porpoises d. penguins e. birds
The arrival of an action potential at a synaptic terminal causes voltage-gated potassium channels to
open. ____________________ Indicate whether the statement is true or false.
The large seaweed known as kelp is classified as a member of the
A) Chlorophyta. B) Phaeophyta. C) Chrysophyta. D) Rhodophyta. E) Deuteromycete.