The phrase "all or nothing," used in conjunction with discussion about an action potential, means that
a. a resting membrane potential has been received by the cell.
b. nothing can stop the action potential once the threshold is reached.
c. the membrane either achieves total equilibrium or remains as far from equilibrium as
possible.
d. propagation along the neuron is saltatory.
e. the action potential is strong.
B
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Which of the molecules below is NOT a subunit for building macromolecules?
A. glucose B. amino acids C. steroid D. fatty acid E. nucleotides
What level of protein structure determines the protein’s final three-dimensional configuration?
a. secondary b. tertiary c. primary d. quaternary
The pituitary gland is regulated most directly by the
a. pineal gland. b. hypothalamus. c. pancreas. d. adrenal gland. e. thyroid gland.
Which of the following is TRUE for female reproductive structures in angiosperms?
A) The sepals are contained within the petals, which enclose the carpel. B) The stamen includes the filament and pollen-producing anther. C) The filament and anther enclose the stigma and style. D) The carpel includes a stigma, a style, and ovules enclosed within an ovary. E) The style, which is vase-shaped, contains the ovary, stigma, and anther.