A rise in sodium levels and extracellular volume leads to a rise in blood pressure. As a result, ____
a. renin levels rise, but aldosterone levels fall
b. renin levels fall, but angiotensin levels rise
c. renin and aldosterone levels rise
d. renin and aldosterone levels drop
e. renin levels drop, but aldosterone levels remain the same
ANSWER: d
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If a red blood cell is placed in a salt solution and bursts, what is the tonicity of the solution relative to the interior of the cell?
a. hypertonic b. Osmotic c. hypotonic d. Isotonic
What systems lend themselves best to the study of environmental factors that lead to the maintenance of sexual reproduction?
a. cyclical parthenogenetic populations that follow highly predictable seasonal patterns independent of environmental changes b. obligate sexual species taxa such as most birds c. species that are polymorphic for sexual/asexual reproduction and show the same proportion of sexual reproduction in all environments d. populations that respond to environmental changes with a change from asexual to sexual reproduction
The length of time a Gprotein will signal is determined by _______
(a) the activity of phosphatases that turn off Gproteins by dephosphorylating G?. (b) the activity of phosphatases that turn GTP into GDP. (c) the degradation of the Gprotein after G??separates from G??? (d) the GTPase activity of G??
Molecules are composed of two or more ____________________ chemically ____________________ together. Fill in the blank(s) with the appropriate word(s)