Biology II Ch. 16 Mastery Learning Test Worksheets
Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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A drug prevents the exit of mRNA from the nucleus. This control is
a. | transcriptional | c. | translational | b. | posttranscriptional | d. | posttranslational |
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2.
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Select the incorrect association.
a. | promoter - accepts RNA polymerase | c. | repressor - binds to
operator | b. | regulator - makes inducer | d. | structural gene - transcriptional unit |
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3.
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Select the correct statement about the lac operon.
a. | It involves at least five enzymes. | b. | It is an inducible operon. | c. | It was first studied
in B. subtilis. | d. | Tryptophan is the inducer in this operon. |
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4.
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Select the correct statement about the trp operon.
a. | It is an inducible operon. | c. | Lactose is the
inducer. | b. | It was first studied in B. subtilis. | d. | Tryptophan is a
corepressor. |
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5.
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Select the incorrect statement about heterochromatin.
a. | It is found in Barr bodies. | c. | Its pattern is highly
diffuse. | b. | It is genetically inactive. | d. | Polytene chromosomes are not in this state. |
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6.
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Chromosome puffs indicate that the
a. | DNA is being destroyed. | c. | genetic material is
radioactive. | b. | DNA is very active. | d. | RNA remains bound to DNA. |
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7.
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An enhancer affects what level of genetic control?
a. | transcriptional | c. | translational | b. | posttranscriptional | d. | posttranslational |
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8.
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Which of the following does NOT describe the behavior of cells in a malignant
tumor?
a. | carry out metastasis | c. | multiply rapidly | b. | lose the ability of contact
inhibition | d. | remain in one
site |
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9.
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An agent that contributes to the development of cancer is a(n)
a. | carcinogen | c. | promoter | b. | oncogene | d. | tumor-suppressor
gene |
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10.
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Which of the following is NOT a suggested measure to prevent cancer?
a. | Avoid foods of the cabbage family. | b. | Cut down on salt-cured
foods. | c. | Eat more high-fiber foods. | d. | Increase the intake of vitamins A and
C. |
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11.
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Which of the following will NOT help you to prevent cancer?
a. | Avoid carcinogenic chemicals. | d. | Eat fewer high-fiber
foods. | b. | Stop smoking. | e. | Eat more broccoli and cauliflower. | c. | Lower total fat
intake. |
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12.
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A promoter
a. | turns on and off the transcription of a set of structural genes. | b. | binds to RNA
polymerase. | c. | codes for the enzymes necessary for the transcription of
polypeptides. | d. | is an intron that breaks up a structural gene. |
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13.
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Antisense RNA controls the expression of a genein bacteria.
a. | transcriptional | c. | translational | b. | posttranscriptional | d. | posttranslational |
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14.
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Given lactose, E. coli. begins to make three enzymes that metabolize this
sugar.
a. | transcriptional | c. | translational | b. | posttranscriptional | d. | posttranslational |
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15.
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The mRNA leaving the nucleus of the hypothalamus and thyroid gland is
different.
a. | transcriptional | c. | translational | b. | posttranscriptional | d. | posttranslational |
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16.
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Feedback controls the metabolic activity of genes.
a. | transcriptional | c. | translational | b. | posttranscriptional | d. | posttranslational |
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17.
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Which statement is descriptive of euchromatin?
a. | A Barr body is in this form. | b. | It is highly compacted and visible with the
light microscope. | c. | Lampbrush chromosomes are an
example. | d. | It is diffuse in its pattern when viewed under the microscope. | e. | Both C and D are
correct. |
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Matching
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Match the following parts of an operon. a. | regulator | c. | structural
genes | b. | promoter | d. | operator |
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18.
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A group of genes that code for enzymes active in a particular metabolic
pathway.
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19.
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A segment of DNA that acts as an on / off switch for transcription of the
structural gene.
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20.
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A gene that codes for a protein that either directly combines with the operator
or else must first join with a metabolite before joining with the operator.
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Short Answer
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21.
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How can you reason that a human muscle cell contains a gene to make the
polypeptides in hemoglobin?
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22.
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How might cancer be cured through a study of gene control systems?
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