A nerve impulse is initiated when
A. a reversal in the polarized state of the cell causes it to reach action potential.
B. voltage-gated channels close.
C. physical disruption of the cell membrane causes some of its contents, including ions, to leak out.
D. the Schwann cells move into their new position.
Answer: A
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Statistical analysis of genetic variation within and among human populations—including those we identify as different races—reveal:
A. more genetic variation between groups than we see within groups. B. more genetic variation within groups than we see between groups. C. no clear pattern of genetic variationâ€"in some regions, we would see more variation within than among groups, and in some regions we would see the opposite. D. a correlation between the amount of genetic variation between groups and the length of time the groups have been isolated from one another. E. None of the above.
What stimulates growth of ovarian follicles?
A. Estradiol B. FSH C. LH D. Progesterone E. Testosterone
Dolly the sheep ________
A) was the first mother who gave birth to a cloned sheep B) received its nuclear DNA from the foster mother C) received its mother's nucleus from her bone marrow D) was the first mammal cloned from an adult cell
Why does increasing the temperature of a chemical reaction generally increase the rate of the reaction?
What will be an ideal response?