When there is a well-established segment of heterochromatin on an interphase chromosome, there is usually a special barrier sequence that prevents the heterochromatin from expanding along the entire chromosome
Gene A, which is normally expressed, has been moved by DNA recombination near an area of heterochromatin. None of the daughter cells produced after this recombination event express gene A, even though its DNA sequence is unchanged. What is the best way to describe what has happened to the function of gene A in these cells?
(a) barrier destruction
(b) heterochromatization
(c) epigenetic inheritance
(d) euchromatin depletion
(c)
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A phosphoanhydride bond
A) is a high-energy bond. B) has a standard free energy of hydrolysis of -7.3 kcal/mol. C) is broken by hydrolysis. D) both choices A and B E) choices A, B, and C
Fermentation
A. uses an inorganic molecule as the final electron acceptor. B. uses an organic molecule as the final electron acceptor. C. results in the production of a large amount of ATP. D. is necessary in some organisms to produce reduced electron carriers. E. uses an organic molecule as the final electron acceptor AND is necessary in some organisms to produce reduced electron carriers.
Communal courting areas are called
A. leks. B. mating structures. C. resource areas. D. territories. E. breeding grounds.
Which organisms reproduce both sexually and asexually?
a. plants and fungi b. animals only c. plants only d. plants and animals