A continual source of genetic variation in populations is ________, which changes one allele into another.
A) mutation
B) migration
C) random mating
D) natural selection
A) mutation
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The Staphylococcaceae staphylococcus that is more likely to cause uncomplicated urinary tract infections in nonhospitalized hosts, especially sexually active young women, is:
a. S. saprophyticus. b. S. aureus. c. S. epidermidis. d. S. intermedius.
. Coliforms are
A. Gram-negative. B. rod-shaped. C. non-spore forming. D. lactose-fermenting with acid and gas formation. E. All of the choices are correct.
Which enzyme links nucleotides into a new stand of DNA?
a. DNA ligase b. DNA mutase c. DNA polymerase d. DNA primer e. DNA replicase
How long ago did the hominin evolutionary
line diverge from that leading to the great apes? a. about 3 million years ago b. between 10 million and 5 million years ago c. during the Eocene epoch d. less than 2 million years ago e. about 1.5 million years ago