The enzymes of animals in old vents should be more flexible than those of animals in young vents.
a. true
b. false
Ans: a. true
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Transposable elements are considered to be "selfish" genes because they _____
A) have multiple promoters B) require multiple RNA polymerases for transcription C) reproduce without increasing the fitness of the host D) do not produce mRNA
Meselson and Stahl's experiments showed that DNA replication is
A) dispersive, conservative, and semi-conservative. B) dispersive, but not conservative or semi-conservative. C) semi-conservative, but not dispersive or conservative. D) quasi-conservative, but not dispersive or semi-conservative.
Introduction of previously nonexistent genes into a population may be accomplished by
a. nonrandom mating. b. mutation. c. sexual recombination. d. the founder effect. e. birth.
Which statement about saturated fatty acids is false?
A) They have a higher melting point than unsaturated fatty acids. B) They form straight, instead of bent, chains. C) No carbon-carbon double bonds are present in the hydrocarbon chain. D) The hydrocarbon chain always includes an odd number of subunits. E) They consist of a polar, hydrophilic "head" and a nonpolar, hydrophobic "tail."