The nuclear envelope consists primarily of
A. a double helix of DNA.
B. ribosomal subunits.
C. two phospholipid bilayers.
D. messenger RNA.
C
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The membrane potential of most neurons at rest is
A. equal to the equilibrium potential for sodium. B. more positive than the equilibrium potential for sodium. C. more positive than the equilibrium potential for potassium. D. equal to the equilibrium potential for potassium. E. slightly more negative than the equilibrium potential of potassium ion.
After prolonged exertion in a hot climate, baroreceptors would ________ firing, leading to ________ secretion of ________ and thus ________ renal reabsorption of ________.
A. increase; increased; renin; increased; Na+ B. increase; decreased; vasopressin; decreased; water C. decrease; decreased; vasopressin; increased; water D. decrease; increased; renin; decreased; Na+ E. decrease; increased; vasopressin; increased; water
Hypertension is often treated with drugs that increase total peripheral resistance.
Answer the following statement true (T) or false (F)
Which of the following is the largest in size?
A) mature sperm cell B) mature egg cell C) polar body D) they are all approximately the same size