Crossing over during prophase I results in ________
A) nondisjunction
B) reciprocal translocation
C) duplication
D) genetic recombination
D
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If a sperm cell containing a defective copy of the gene on the Y chromosome that encodes testosterone fertilizes an egg, what effect will this have on the developing embryo?
a. There will be no effect so long as the X chromosome is intact. b. The cells of the embryo will undergo apoptosis early in development. c. The embryo will develop female sexual tissues and characteristics. d. Increased hair growth will begin in utero and continue until adolescence.
Scorpion muscle contraction is fueled directly by energy derived from
a. lactic acid. b. ADP. c. ATP. d. ethanol.
What is the minimum number of aminoacyl-tRNA synthetase enzymes needed to attach amino acids to all the various tRNA molecules?
A. 64 B. 61 C. 20 D. As many as there are different tRNAs
Which of the following methods of preserving food sterilizes it?
A) canning B) pasteurization C) drying D) gamma radiation E) lyophilization