DNA fragments cut by most restriction enzymes have:
A) either only sequences of Gs or only sequences of Cs.
B) protruding sticky ends.
C) double-stranded complementary ends.
D) cuts made at random points along one of the strands.
Answer: B
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A. chickens B. cattle C. turkeys D. All of the choices are correct.
An amino acid contains all of the following except a/n ________.
A. variable R group B. carboxyl group C. ? carbon D. phosphate E. amino group
Of the sites listed below, which is most likely to be free of any normal microbiota?
A. nasopharynx B. uterus C. vagina D. large intestine
It is generally accepted that the vertebrates that evolved during the early Devonian period are the
A. sharks and bony fish. B. hominoids. C. birds. D. dinosaurs. E. mammals.