What is the pH of a solution with a hydroxyl ion (OH-) concentration of 10-12 M?
A) pH 2
B) pH 4
C) pH 10
D) pH 12
E) pH 14
Answer: A
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The region of the centromere contains repeated DNA sequences known as ________.
Fill in the blank(s) with the appropriate word(s).
A chemical or physical agent that causes mutations is called a
A) mutator. B) tautomer. C) teratomer. D) mutagen.
A flower is not ideally matched with a pollinator that visits it daily. Why might that be?
A) The flower does not need pollination. B) The flower is imperfect. C) The flower does not have sufficient nutrients. D) The flower has several other pollinators with differing traits.
Which of the following is a consequence of breathing secondhand smoke?
A) Nonsmoking children of smokers are more likely to contract pneumonia. B) Nonsmoking children of smokers are less likely to develop atherosclerosis. C) Smokers are more likely to have increased lung capacity. D) Nonsmoking spouses of smokers have a 30% lower risk of heart attack.