The Xist gene product

A. is never translated into protein.
B. is required for the production of Barr bodies.
C. coats the X chromosome with RNA.
D. associates with proteins to compact the chromosome.
E. All of these statements are correct.


E. All of these statements are correct.

Biology & Microbiology

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The activation energy of a reaction refers to the

minimum amount of energy a. released by the reaction. b. in the reactants. c. in the products. d. necessary to cause it to proceed on its own. e. difference between the energy of the reactants and the energy of the products.

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Reproductive isolating mechanisms typically evolve

after gene flow __________. Fill in the blank(s) with the appropriate word(s).

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In the United States, about __________ teenagers

join the ranks of habitual smokers each day. a. 1,000 b. 2,000 c. 3,000 d. 4,000 e. 5,000

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Which statement about sperm entry is TRUE?

a. The fertilization cone formed by microvilli of the egg membrane contracts and draws the sperm inward. b. The egg phagocytizes the acrosome of the sperm so it can enter the cell.

c. The cilia on the egg membrane beat and sweep the sperm inside. d. The sperm releases calcium ions, which make the egg membrane permeable to its entry. e. The egg secretes bindin protein, which allows sperm penetration.

Biology & Microbiology