Biology II Ch. 16 Testing Yourself in Text
Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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Which type of prokaryotic cell would be more successful as judged by its growth
potential?
a. | One that is able to express all its genes all the time. | b. | One that is unable
to express any of its genes any of the time. | c. | One that expresses some of its genes some of
the time. | d. | One that divides only when all types of amino acids and sugars are present in the
medium. |
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2.
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When lactose is present
a. | the repressor is able to bind to the operator | b. | the repressor is
unable to bind to the operator | c. | transcription of structural genes
occurs | d. | both B an C are correct |
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3.
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When trytophan is present
a. | the repressor is able to bind to the operator | b. | the repressor is
unable to bind to the operator | c. | transcription of structural genes
occurs | d. | both B and C are correct |
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4.
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Which of these is mismatched?
a. | posttranslational control - nucleus | c. | translational control -
cytoplasm | b. | transcriptional control - nucleus | d. | posttranscriptional control -
nucleus |
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5.
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RNA processing varies in different cells. This is an example of
_________________ control over gene expression.
a. | transcriptional | c. | translational | b. | posttranscriptional | d. | posttranslational |
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6.
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A scientist adds radioactive uridine (label for RNA) to a culture of cells and
examines an autoradiograph. Which type of chromatin is apt to be labeled?
a. | heterochromatin | c. | both A and B are correct | b. | euchromatin | d. | neither A nor B is correct |
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7.
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If Barr bodies were genetically active, females heterozygous for an x-linked
gene would
a. | be mosaics | c. | die | b. | not be mosaics | d. | both B and C are
correct |
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8.
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Which of these might cause a proto-oncogene to become an oncogene?
a. | exposure to radiation | c. | viral infection of the cell | b. | exposure of cell to
certain chemicals | d. | all of
these are correct |
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9.
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A cell is cancerous. Where might you find an abnormality?
a. | only in the nucleus | b. | only in the plasma membrane
receptors | c. | only in cytoplasmic reactions | d. | in any part of the cell concerned with growth
and cell division |
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10.
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A tumor-suppressor gene
a. | inhibits cell division | c. | prevents cancer | b. | opposes oncogenes | d. | all of these are
correct |
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Matching
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Question #11 a. | mRNA | b. | promoter | c. | active repressor protein | d. | operator | e. | regulator gene | f. | DNA |
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11.
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Picture A
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12.
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Picture B
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13.
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Picture C
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14.
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Picture D
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15.
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Picture E
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16.
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Picture F
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Completion
17-26 go with Understanding the Terms
Word Bank on page 268.
Complete each statement.
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17.
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Understanding the Terms
A.
Cancer-causing gene.
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18.
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B. Abnormal growth derived from a single mutated cell that has repeatedly
undergone cell division; may be benign or malignant.
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19.
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C. Dark-staining body in the nuclei of female mammals that contains a
condensed, inactive X chromosome.
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20.
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D. Diffuse chromatin, which is being transcribed.
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21.
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E. Environmental agent that causes mutations leading to the development
of cancer.
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22.
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F. Gene that codes for a protein that ordinarily suppresses cell
division.
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23.
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G. Gene that codes for an enzyme in a metabolic pathway.
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24.
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H. Group of structural and regulating genes that functions as a single
unit.
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25.
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I. Highly compacted chromatin that is not being transcribed.
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26.
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J. In an operon, a sequence of DNA where RNA polymerase begins
transcription.
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