_____ selected species have a low rate of per capita growth.
A. r-
B. S-
C. K-
D. ?-
E. J-
C. K-
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An example of an osmoconformer is:
a. a crab. b. a polychaete worm. c. a fish. d. a sea squirt (tunicate).
If an individual is heterozygous at two loci (A b / a B) that are located on the same chromosome arm with A closer to the centromere than B, under what conditions would a crossover in a somatic cell generate a twin spot?
A) The crossover would have to occur between the A locus and the centromere and involve two homologous, nonsister chromatids. B) The crossover would have to occur between the A locus and the B locus and involve two homologous, nonsister chromatids. C) The crossover would have to occur between the B locus and the end of the chromosome and involve two homologous, nonsister chromatids. D) A double crossover would have to occur, with one crossover between the A locus and the centromere and a second crossover between the A and B loci, and both crossovers would have to involve two homologous, nonsister chromatids. E) No crossover in a somatic cell could generate a twin spot.
When an organism such as a yeast lives by fermentation, it converts the pyruvate from glycolysis into a different compound, such as alcohol. Why doesn't it secrete the pyruvate directly?
A) The conversion yields 32 ATP per pyruvate molecule. B) The conversion yields 1 NADH per pyruvate molecule. C) The conversion is needed to regenerate the molecules needed for glycolysis. D) A buildup of pyruvate in the surrounding environment would be too toxic.
How is the ampicillin a "selectable marker"?
A) It only allows for cells with the ampicillin resistance gene to grow B) It selects which bacteria can transform C) It allows bacteria to transform D) It only allows for cells with the ampicillin resistance gene to glow