The pathway on the left is named for what is happening in the figure labeled with letter ____
a. A
b. B
c. C
d. D
e. E
ANSWER: e
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In skeletal muscle contraction, which of the following must be moved to the grooves in the actin
double helix to uncover the crossbridge binding site?
a. troponin b. Ca2+ c. tropomyosin d. ATP e. acetylcholine
Which group is most closely related to animals?
1.Slime molds 2.Dinoflagellates 3.Choanoflagellates 4.Ciliates
During an action potential, the membrane potential ____
a. becomes more negative as sodium enters the cell b. becomes more negative as potassium leaves the cell c. becomes more positive as sodium enters the cell d. becomes more positive as sodium leaves the cell e. remains at -70 mV until threshold is reached
Which of these organisms does not produce a neurotoxin?
A) Clostridium botulinum bacteria B) Clostridium tetani bacterium C) rabies virus D) Alexandrium algae