What characteristics make bacteria like E. coli attractive as model organisms?
A) short generation time, simple genome relative to to that of humans, easily mutagenized, haploid, gene control mechanisms identical to eukaryotes
B) short generation time, simple genome relative to to that of humans, easily mutagenized, haploid
C) short generation time, genome as complex as that of humans, easily mutagenized, haploid
D) short generation time, simple genome relative to to that of humans, easily mutagenized, diploid
B) short generation time, simple genome relative to to that of humans, easily mutagenized, haploid
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Thigmotropism is a growth response to
a. light. b. day length. c. contact with a solid object. d. circadian rhythms. e. gravity.
Because of the redundancy in the genetic code, many mutations in the coding regions of genes are:
A: somatic mutations. B: silent mutations. C: transitions. D: inversions. E: transversions.
A Pasteur flask has a(n)
A) swan neck to prevent particulate matter from getting into the main body of the flask. B) double neck so two substances may be added at the same time. C) secondary opening at the base to allow for drainage. D) inverted upper edge to prevent spillage while swirling.
Biology books earlier in this century assumed that the earliest protocells would have to be autotrophs. This concept appears to be
A. correct, since heterotrophs would depend upon eating autotrophs. B. correct, since life is not possible without ATP, which is only available in living systems. C. correct, since glycolysis and fermentation only occur after oxygen is present from photosynthesis. D. incorrect, since the primordial soup could contain many preformed food molecules. E. incorrect, since glycolysis and fermentation require complex enzymes for catalytic reactions.