Simple diffusion and facilitated diffusion are related in that both
(A) require protein carriers
(B) depend on a concentration gradient
(C) occur via contractions of cytoskeletal elements attached to membrane proteins
(D) are endergonic processes and thus require the hydrolysis of ATP
(E) occur in eukaryotic cells but not in prokaryotic cells
Answer: (B) depend on a concentration gradient
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Microbial activity generates methylmercury, which is much less toxic than the mercuric ion
Indicate whether the statement is true or false.
Most dinosaurs died out at the end of the
a. Triassic. b. Jurassic. c. Cretaceous. d. Tertiary. e. Permian.
The molting hormone of arthropods is:
a. corticotropin b. MSH c. oxytocin d. ecdysone e. adrenalin
Fats that your body cannot make are called
a. essential fatty acids. b. triglycerides. c. phospholipids. d. saturated fats. e. sterols.