Action potentials are
a. faster in neurons than in muscle cells.
b. faster in muscle cells than in neurons.
c. essentially the same in neurons and muscle cells.
d. completely different in neurons and muscle
cells.
e. none of these.
Answer: c
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A) beta-pleated sheet B) double parallel helical strands C) turn-loop-turn D) double antiparallel helical strands
While wastewater is in an activated sludge tank, much of the organic matter is
A) oxidized. B) adsorbed to the floc. C) incorporated into microbial cells. D) oxidized, adsorbed to the floc, and incorporated into microbial cells.
Atoms in which the number of electrons does not equal the number of protons are known as:
A. valences. B. ions. C. isotopes. D. isomers.
Which of the following plant cells has a companion cell?
a. tracheids b. vessel elements c. sieve elements d. sclereids e. fibers