Diffusion _____
A) is very rapid over long distances
B) requires an expenditure of energy by the cell
C) is a passive process in which molecules move from a region of higher concentration to a region of lower concentration
D) requires integral proteins in the cell membrane
C
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Nonsense codons are
A) codons that code for multiple amino acids. B) codons that do not code for an amino acid. C) codons that can be read forward or backward. D) start codons.
Which is NOT one of the four extraembryonic
membranes of the amniote egg? a. albumin b. amnion c. chorion d. allantois e. yolk sac
The structure that people typically refer to as a
“mushroom” is in reality the a. basidiocarp. b. mycelium. c. ascocarp. d. hyphal mass. e. zygospore.
A transmembrane protein differs from other membrane proteins because it:
a. is covalently linked to the outer surface of the plasma membrane. b. is a glycoprotein with carbohydrates attached. c. is attached to the inside of the membrane by an ionic bond. d. completely extends through the membrane. e. is completely embedded within the membrane