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

Biology & Microbiology

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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

Biology & Microbiology

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.

Biology & Microbiology

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.

Biology & Microbiology

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."

Biology & Microbiology