Cholesterol ____
a. has a rigid backbone of four nitrogen rings
b. is the most common steroid in animal tissue
c. is a lipid with a fatty-acid component
d. is needed to inhibit sexual development and maturity
e. is needed to lubricate feathers
ANSWER: b
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Match the correct case study in conservation biology with its animal.
A. fruit bats—introduction of new species B. prairie chickens—loss of genetic diversity C. songbirds—introduction of new species D. whales—pollution E. Lake Victoria cichlids—loss of habitat
What structural motif is most commonly used by transcription factors in binding to DNA?
A. Zinc-finger B. Helix-turn-helix C. Leucine zipper D. Homeodomain
The movement of excess H+ and K+ ions from
peritubular capillaries to the nephron tubules is a. reabsorption. b. secretion. c. excretion. d. filtration. e. osmosis.
Which of the following techniques is most commonly used to separate DNA molecules by size?
A) PCR B) RFLP C) Chromatography D) DNA sequencing E) Gel electrophoresis