Uptake of low-density lipoproteins (LDLs) occurs by
A) simple diffusion.
B) bulk-phase endocytosis.
C) facilitated transport.
D) receptor-mediated endocytosis.
E) pinocytosis.
D) receptor-mediated endocytosis.
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Which ions are important for establishing the resting potential in neurons?
A. Na+ B. K+ C. Intracellular anions (e.g., proteins) D. H+ E. All of the choices other than H+ are correct
Directional selection occurs when
a. the environment controls which organisms will survive. b. humans determine which organisms will survive. c. the extremes of the population have a lesser chance to survive. d. the extremes of the population have a better chance to survive. e. the organisms on one extreme of the population have a better chance to survive than those on the other extreme.
Which is NOT a biogeographic realm?
a. Palearctic b. Ethiopian c. Equatorial d. Oriental e. Australian
Small animals, such as water striders and water spiders, can run across a pond's surface due to ________
Fill in the blank(s) with correct word