What is the original source of variation that natural selection can act upon?
A) Mutation
B) Gene flow
C) Genetic drift
D) All of the above
A
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The order of gene transfer in an Hfr × F- mating is best represented by
A. part of the chromosome followed by the plasmid followed by the rest of the chromosome. B. all plasmid genes followed by some or all of the chromosome. C. part of the plasmid followed by the chromosome followed by the rest of the plasmid. D. the chromosome followed by the plasmid.
Shiga toxin-producing E. coli characteristics include all of the following except that it
A. is transmitted by ingestion of contaminated, undercooked food, especially hamburger. B. in some cases, leads to the development of hemolytic uremic syndrome (HUS) with possible kidney failure C. causes a bloody diarrhea. D. has a reservoir inside of cattle intestines. E. only causes occupational illness in people who work with animals.
When sampling blood from a corpse, it is best practice to collect blood samples from multiple sites on the body.
a. true b. false
During phase I clinical trials, a new drug is tested ________
A) on thousands of human volunteers B) on a few hundred human volunteers C) in an animal model D) on fewer than 100 human volunteers