Gene duplication can result from _____
a. a normal crossover event
b. exon shuffling
c. unequal crossing over
d. a point mutation
e. alternative splicing
ANSWER: c
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Which of the following is incorrectly paired?
a. veins—typically carry deoxygenated blood b. capillaries—blood vessels with smallest diameter c. lymph vessels—contain mainly water and some blood cells d. alveolus—increases surface area for exchange
Victims of CO poisoning turn “classic cherry red” in ____ percent of cases
a. 90 b. 50 c. 20 d. 2 e. 0
Nonsense mutations are mutations caused by nucleotide substitutions that change one amino acid into
another. Indicate whether the statement is true or false.
Adjacent microtubule doublets in cilia and flagella produce a bending movement because
a. tubulin is contracting on one side of the microtubules. b. dynein is contracting on one side of the microtubules. c. kinesin is contracting on one side of the microtubules. d. nexin links between microtubule doublets convert a sliding movement into a bending movement. e. dynein heads move in a plus-end direction.