When DNA is replicated, ____
a. parental histones are degraded and entirely replaced by new histones
b. DNA is permanently freed from histone binding
c. the histone proteins are also replicated
d. only some of the histone proteins are replicated
e. the number of histones that bind to each DNA molecule is halved
ANSWER: c
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The difference between normal and sickle-cell hemoglobin is based upon the
a. number of amino acids in the molecule. b. substitution of one amino acid for another. c. number and orientation of the amino acid chains attached to the heme portion of the molecule. d. number of oxygen molecules that can be carried. e. type of bone marrow that produces it.
In a Punnett square, the letters within the little boxes represent
a. offspring genotypes. b. parental genotypes. c. gametes. d. offspring phenotypes. e. parental phenotypes.
The Russian-American biochemist Phoebus Levene was the first to determine that nucleotides may contain one of four different nitrogen-containing bases. Levene believed that the nitrogen-containing bases occurred in equal amounts in DNA. What is the actual proportion of these bases?
a. DNA contains twice as much adenine and thymine as guanine and cytosine. b. All four do actually occur in equal amounts. Levene was right. c. DNA contains equal amounts of adenine and thymine, and equal amounts of guanine and cytosine. d. DNA contains equal amounts of guanine and thymine, and equal amounts of adenine and cytosine. e. DNA contains equal amounts of adenine and guanine, and equal amounts of thymine and cytosine.
The distinguishing characteristic used to classify the algae into four kingdoms is
A) whether they are single celled or multicellular. B) their cell wall components. C) their storage products. D) their habitat. E) presence or absence of chlorophyll a.