Household ammonia has a pH of 12; household bleach has a pH of 13. Which of the following statements about these substances is true?
A) Both of these substances are strong acids.
B) The ammonia has 10 times as many OH- ions as the bleach.
C) The ammonia has 10 times as many H+ ions as the bleach.
D) A solution that could buffer the bleach and ammonia would remove excess OH- ions.
Answer: C
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Marfan syndrome can be caused by mutations in either of two genes involved in the disorder, but mutations in one of the genes blocks activity of the other. This means that Marfan syndrome demonstrates
A) variable expressivity and complete penetrance. B) an acquired phenotype. C) late onset and early onset. D) genetic heterogeneity and epistasis.
An allosteric enzyme:a
has an active site that binds to the substrate and an allosteric site that binds to the product. b. allows the movement of molecules and ions from one part of the cell to another. c. catalyzes both oxidation and reduction reactions. d. raises a reaction's activation energy so that the rate of the reaction declines. e. allows a substance other than the substrate to bind to the enzyme, thereby activating or inactivating it
Which of the following sequences is most likely to be cut by a restriction enzyme?
A) AATTCT TTAAGA B) AATATT TTATAA C) AAAATT TTTTAA D) ACTACT TGATGA
Male sex hormones are
A. androgens. B. estrogens. C. gonads. D. semen.