Depolarization of the nerve cell membrane occurs because
A. sodium is not being pumped out of the cell.
B. there is a reverse of polarity due to an increase in the amount of potassium in the cell.
C. the permeability of the membrane changes and allows sodium ions to flow into the cell by diffusion.
D. sodium ions are actively pumped into the cell.
C. the permeability of the membrane changes and allows sodium ions to flow into the cell by diffusion.
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The midrange of an array of phenotypes is favored in ____.
A. genetic drift B. disruptive selection C. gene flow D. stabilizing selection E. directional selection
Genes that are always "turned on" in a cell are referred to as
A) regulated genes. B) mutations. C) inducible. D) constitutive. E) catabolic.
Reactive oxygen species include all of the following except
a. hydroxyl radical b. oxygen molecules c. superoxide anion d. peroxide radic
In primitive land plants, such as mosses and ferns, how does the sperm get to the egg?
What will be an ideal response?