A fragile site
a. is found only on the X chromosome.
b. occurs in only one of the sister chromatids.
c. is associated with cancerous cells.
d. is usually not inherited.
e. is the result of genomic imprinting
C
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Which of the following is not true of repairing double-strand breaks by recombination?
A. After invasion of the homologous chromosome, the 3' end of the invading strand acts as a primer for DNA synthesis. B. The broken ends are processed, with the 3'-ending strand selectively degraded to create 5' overhangs. C. The 3' single strand extensions invade the homologous chromosome, displacing the homologous strand and base pairing with the complementary strand. D. As a result of the two strand invasions, the two homologues are linked at two places and are called a branched intermediate. E. The enzymes required for strand invasion belong to a class of proteins called recombinases.
Which statement does NOT distinguish Darwin’s theory of natural selection from earlier descriptions of biological
diversity and adaptive traits?
a. Biological diversity has purely physical, rather than spiritual, origins. b. Evolutionary change occurs in groups of organisms, rather than in individuals. c. Spiritual explanations account for the origin but not the diversification of individuals. d. Some organisms function better than others in a particular environment. e. Evolution is a multistage process and natural selection eliminates unsuccessful variations.
When ?G' = 0 in a chemical reaction, under standard conditions,
A) reactants and products are at equilibrium. B) work can be done; energy is required. C) the reaction is spontaneous to the left. D) no work can be done; no energy is required. E) reactants and products are at equilibrium; no work can be done; no energy required.
The primary mechanism for exchange of substances across the capillary wall is
A) bulk flow. B) vesicle transport. C) active transport. D) mediated transport. E) diffusion.