The polymerase chain reaction (PCR) has been used in all of the following fields, except
A. gene mapping.
B. medicine.
C. forensics.
D. evolutionary studies.
E. None of the choices; it is useful for all these fields.
Answer: E
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About ________ percent of human genes are alternately spliced.
A) 10 B) 40 C) 75 D) 90
What allows a sperm to penetrate an egg during fertilization?
a. The egg has receptors for the sperm to bind to allows for passage through the membrane. b. The sperm sends out a signal and the egg brings the sperm inside via phagocytosis. c. Enzymes within the acrosome allow the sperm and egg plasma membranes to fuse. d. The egg recognizes the sperm and degenerates the zona pellucida.
The mutation that resulted in the lighter skin
color of people of European descent occurred between ____ and ____ years ago.
a. 100...600 b. 1000...6000 c. 6000...10,000 d. 100, 000...600,000 e. 600,00... 1,000,000
Each nucleotide contains
1.a five carbon sugar. 2.an amino group. 3.a sulfur atom. 4.a phosphate group. 5.both a five carbon sugar and a phosphate group.