bio exam chap 11 – Flashcards
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5) In prokaryotes, the production of a single RNA transcript for a group of related genes is under the control of the ______.
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A) operon
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6) In an operon, the ______ acts as an on/off switch.
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A) operator
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7) Which of the following turns off transcription by binding to the operator?
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B) repressor
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8) Repressors act by blocking the binding of _____ to the operator.
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D) RNA polymerase
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9) What would you assume if you found RNA transcripts of lactose-utilizing genes within E. coli?
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B) the presence of lactose
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10) While examining a human cell that functions normally, you determine that it has 45 functional chromosomes and one chromosome that is almost completely inactive. You immediately decide that it is very likely that this cell ______.
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A) came from a normal human female
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11) What is the first level of control of eukaryotic gene transcription?
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C) DNA packing and unpacking
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12) Male tortoiseshell cats ______.
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D) are likely to be exceedingly rare and very likely to be sterile since normal male cats are XY
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13) Which of these plays a role in the regulation of transcription in both prokaryotic and eukaryotic cells?
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B) attachment of RNA polymerase to the promoter
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14) In eukaryotic cells, repressor proteins inhibit transcription by binding to ______.
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A) silencers
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15) Introns are ______.
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A) noncoding DNA sequences
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16) Which of these is a type of post-transcriptional regulation of gene expression?
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C) alteration of proteins
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17) How can a single RNA transcript be translated into different polypeptides?
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A) There is more than one way to splice an RNA transcript.
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18) Cells communicate with one another via ______.
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C) signal transduction pathways
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19) The "master control genes" that regulate other genes, which determine what body parts will develop in which locations, are called ______.
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B) homeotic genes
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20) Which of these is most likely to cause the development of a six-legged frog?
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A) mutation of homeotic genes
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21) Homeotic genes ______.
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C) are evidence of the common ancestry of eukaryotic organisms
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22) Which of these techniques could tell you how gene expression differs between individuals with and without cystic fibrosis?
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B) DNA microarray
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23) How is it that the cells in different body tissues are able to perform different functions?
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A) The cells exhibit different patterns of gene expression.
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24) Reproductive cloning involves
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C) be dedifferentiated
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25) Possible uses of reproductive cloning include ______.
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D) all of the above.
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26) What is a difference between embryonic and adult stem cells?
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B) Embryonic stem cells are undifferentiated; adult stem cells are partially differentiated.
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27) What name is given to a gene that causes cancer?
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D) oncogene
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28) Many proto-oncogenes regulate ______.
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C) cell division
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29) Inheritance of certain genes increases the risk of getting certain cancers; thus, it can be said that ______.
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C) predisposition to these cancers is inherited
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30) Data suggest that the normal version of BRCA1 functions as a(n) ______.
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B) tumor-suppressor gene
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31) Which risk factors are associated with cancer of the colon and rectum?
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D) dietary fat
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32) ______ is(are) responsible for more cancers than any other carcinogen.
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C) Tobacco
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33) More people die of ______ cancer than of any other cancer.
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A) lung
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34) Which of these lifestyle choices will increase cancer risk?
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C) a diet low in plant fiber
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1) Jim learned that some cancer cells produce more growth-stimulating proteins than others. What would you give him as a plausible explanation?
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B) Proto-oncogenes may have mutated to become oncogenes in these cells.
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2) Jim learned that viruses can sometimes cause cancer and wants to know why. You tell him that ______.
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C) a human cell can acquire an oncogene from a virus.
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