A cell in prophase I of meiosis has ______________ as many chromosomes as each of the daughter cells following cytokinesis of meiosis II
A. twice
B. half
C. one-quarter
D. four times
A
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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.
In fungi, food materials are digested:
a. within food vacuoles b. outside the body c. intracellularly d. by the mitochondria e. by the host organism
The role of oxygen in cellular respiration is to
a. combine with carbon atoms to form carbon dioxide. b. allow glycolysis to continue. c. act as the final electron acceptor. d. aid in the transport of pyruvate into the mitochondria. e. supply an energy molecule.
Binding of the activating nucleotide di- or triphosphate causes the Ras protein to (first)
a. separate into subunits. b. split the terminal phosphate from the nucleotide-phosphate. c. undergo a conformational change. d. attach a farnesyl tail.