Cuvier, an anatomist and paleontologist, proposed that ____
a. all present-day organisms have descended, with adaptations, from one--or possibly a few--original organisms
b. Earth's history has been marked by several periods when destruction of populations was widespread and that, after each such period, the earth was repopulated
c. evolutionary changes in organisms are caused by use and disuse
d. although evolution is responsible for all the changes that happen to species, one center of creation resulted in
the original members of each species
e. geologic processes in Earth have not changed over billions of years
ANSWER: b
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The force driving simple diffusion is _____, while the energy source for active transport is _____
A) the concentration gradient; ADP B) the concentration gradient; ATP C) transmembrane pumps; electron transport D) phosphorylated protein carriers; ATP
The ____ has a digestive tract
a. coral b. earthworm c. flatworm d. hydra e. sea anemone
During receptor-mediated endocytosis
a. plasma membrane receptors bind molecules to be enclosed. b. a small pit forms beneath the receptors. c. a pit closes back on itself. d. a vesicle forms. e. all of these occur.
Antigens bind at
a. A. b. B. c. C. d. D. e. E.