Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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Avery’s experiments showed that bacteria are transformed by
a. | RNA. | c. | proteins. | b. | DNA. | d. | carbohydrates. |
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2.
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What did Griffith observe when he injected a mixture of heat-killed,
disease-causing bacteria and live harmless bacteria into mice?
a. | The disease-causing bacteria changed into harmless bacteria. | b. | The mice developed
pneumonia. | c. | The harmless bacteria died. | d. | The mice were
unaffected. |
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Figure
12–1
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3.
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Figure 12–1 shows the structure of a(an)
a. | DNA molecule. | c. | RNA molecule. | b. | amino acid. | d. | protein. |
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4.
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Which of the following is a nucleotide found in DNA?
a. | ribose + phosphate group + thymine | b. | ribose + phosphate group +
uracil | c. | deoxyribose + phosphate group + uracil | d. | deoxyribose + phosphate group +
cytosine |
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5.
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Because of base pairing in DNA, the percentage of
a. | adenine molecules in DNA is about equal to the percentage of guanine
molecules. | b. | pyrimidines in DNA is about equal to the percentage of purines. | c. | purines in DNA is
much greater than the percentage of pyrimidines. | d. | cytosine molecules in DNA is much greater than
the percentage of guanine molecules. |
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6.
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In eukaryotes, DNA
a. | is located in the nucleus. | c. | is located in the
ribosomes. | b. | floats freely in the cytoplasm. | d. | is circular. |
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7.
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During mitosis, the
a. | DNA molecules unwind. | b. | histones and DNA molecules
separate. | c. | DNA polymerase makes copies of DNA strands. | d. | nucleosomes become
more tightly packed. |
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8.
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Which of the following include all the others?
a. | DNA molecules | c. | chromosomes | b. | histones | d. | nucleosomes |
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9.
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DNA is copied during a process called
a. | replication. | c. | transcription. | b. | translation. | d. | transformation. |
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10.
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DNA replication results in two DNA molecules,
a. | each with two new strands. | b. | one with two new strands and the other with two
original strands. | c. | each with one new strand and one original
strand. | d. | each with two original strands. |
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11.
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During DNA replication, a DNA strand that has the bases CTAGGT produces a strand
with the bases
a. | TCGAAC. | c. | AGCTTG. | b. | GATCCA. | d. | GAUCCA. |
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Modified True/False
Indicate
whether the statement is true or false. If false, change the identified word or phrase to make
the statement true.
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12.
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The replication of a DNA molecule results in four copies of the same
gene. _________________________
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13.
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DNA is tightly wrapped around nucleosomes.
_________________________
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14.
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In eukaryotes, DNA replication proceeds in one direction along the DNA
molecule. _________________________
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