Jacob, Wollman, and others developed a linkage map of E. coli that is based on time. What form of recombination is involved in generating a linkage map based on time?
What will be an ideal response?
Conjugation; an Hfr bacterium conjugating with an F- strain allows the generation of a map that is dependent on the passage of the donor chromosome across a conjugation tube.
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When all individuals in a population with a certain illness have the same mutation, which present-day patients inherited from shared ancestors, it is an evidence of
A) random mating. B) migration. C) population bottlenecks. D) founder effect.
Which of the following explains why a saturated fat and an unsaturated fat are different?
a. A saturated fat contains double bonds, while an unsaturated fat does not. b. An unsaturated fat contains double bonds, while a saturated fat does not. c. A saturated fat is liquid at room temperature, while an unsaturated fat is not. d. A saturated fat can be called an oil, while an unsaturated fat cannot.
Which one of the following enables T helper cells to stimulate and activate other cells of the immune response?
A) interferon B) cytokines C) antibodies D) complement E) histamine
An example of a density-dependent factor that influences the size of a population is:
a. rainfall. b. temperature. c. a fire. d. parasites. e. an earthquake