To increase the proportion of auxotrophic mutants in a population of bacteria, one may use
A. direct selection.
B. replica plating.
C. penicillin enrichment.
D. individual transfer.
C
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What will be an ideal response?
Predators that prevent the population of their prey from exploding and thus outcompeting their prey are called:
a. regulators. b. herbivores. c. keystone species. d. omnivores. e. decomposers.
If a strain of bacteria had a mutation that blocked expression of the lac repressor, what would you expect as a result?
A. The mutant strain would act the same, because it would still require lac activator protein to turn on. B. The mutant strain would waste energy producing enzymes in the absence of lactose. C. The mutant strain would grow at the same rate as wild-type if lactose was not present. D. The mutant strain would outcompete wild-type strains, since it could always utilize lactose.
If your parents are heterozygous for a gene, what is the chance that you will have at least one copy of it?
A) 0% B) 75% C) 25% D) 50%