The molecules in the plasma membrane that serve as receptors for other molecules are the:
a. phospholipid molecules
b. cholesterol molecules
c. protein molecules
d. all of the above
c. protein molecules
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A red blood cell is placed in a hypertonic solution. This means the concentration of solutes in the solution is ________ than the concentration of solutes in the intracellular fluid, and will cause the cell to ________
A) lower; shrink B) higher; swell C) lower; swell D) lower; burst E) higher; shrink
In prokayotes, the structure that assembles proteins by using information in RNA a(an) ?
A. plasmid. B. nucleoid. C. endospore. D. cell membrane. E. ribosome.
Which of the following is NOT a definition of sex, according to the text?
A. Behavior that increases the likelihood of gametic union B. The state of being a male or a female C. Behavior that increases the chance of orgasm D. Behavior that produces arousal
The dominant inorganic cation in blood is
a. Na+ b. Cl- c. K+ d. HCO3- e. Ca2+