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ch 18

24 Questions  I  By Grtnb
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Ch 18

  
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Question Excerpt

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1.  A researcher found a method she could use to manipulate and quantify phosphorylation and methylation in embryonic cells in culture. She tried decreasing the amount of methylation enzymes in the embryonic stem cells and then allowed the cells to further differentiate. Which of the following results would she most likely see?
A.
B.
C.
D.
E.
2.  If glucose is available in the environment of E.coli, the cell responds with very low concentration of cAMP. When the cAMP increases in concentration, it binds to CAP. Which of the following would you expect would then be a measurable effect?
A.
B.
C.
D.
E.
3.  When this is taken up by the cell, it binds to the repressor so that the repressor no longer binds to the operator
A.
B.
C.
D.
E.
4.  Gene expression might be altered at the level of post-transcriptional processing in eukaryotes rather than prokaryotes because of which of the following?
A.
B.
C.
D.
E.
5.  Altering patterns of gene expression in prokaryotes would most likely serve the organismʹs survival in which of the following ways?
A.
B.
C.
D.
E.
6.  Which of the following statements describes proto-oncogenes?
A.
B.
C.
D.
E.
7.  A researcher found a method she could use to manipulate and quantify phosphorylation and methylation in embryonic cells in culture. One of her colleagues suggested she try increased methylation of C nucleotides in a mammalian system. Which of the following results would she most likely see?
A.
B.
C.
D.
E.
8.  A lack of this nonprotein molecule would result in the inability of the cell to "turn off" genes
A.
B.
C.
D.
E.
9.  This is the site in the DNA located near the end of the final exon, encoding an RNA sequence that determines the 3' end of the transcript
A.
B.
C.
D.
E.
10.  What does the operon model attempt to explain?
A.
B.
C.
D.
E.
11.  For a repressible operon to be transcribed, which of the following must occur?
A.
B.
C.
D.
E.
12.  This can inhibit transcription by blocking the binding of positively acting transcription factors to the DNA
A.
B.
C.
D.
E.
13.  A mutation in this section of DNA could influence the binding of RNA polymerase to the DNA
A.
B.
C.
D.
E.
14.  In response to chemical signals, prokaryotes can do which of the following?
A.
B.
C.
D.
E.
15.  A researcher found a method she could use to manipulate and quantify phosphorylation and methylation in embryonic cells in culture. In one set of experiments using this procedure in Drosophila, she was readily successful in increasing phosphorylation of amino acids adjacent to methylated amino acids in histone tails. Which of the following results would she most likely see?
A.
B.
C.
D.
E.
16.  This binds to a site in the DNA far from the promoter to stimulate transcription
A.
B.
C.
D.
E.
17.  The role of a metabolite that controls a repressible operon is to
A.
B.
C.
D.
E.
18.  This protein is produced by a regulatory gene
A.
B.
C.
D.
E.
19.  Forms of the ras protein found in tumors usually cause which of the following?
A.
B.
C.
D.
E.
20.  Which of the following is characteristic of the product of the p53 gene?
A.
B.
C.
D.
E.
21.  A researcher found a method she could use to manipulate and quantify phosphorylation and methylation in embryonic cells in culture. In one set of experiments she succeeded in decreasing methylation of histone tails. Which of the following results would she most likely see?
A.
B.
C.
D.
E.
22.  Two potential devices that eukaryotic cells use to regulate transcription are
A.
B.
C.
D.
E.
23.  Steroid hormones produce their effects in cells by
A.
B.
C.
D.
E.
24.  The tryptophan operon is a repressible operon that is
A.
B.
C.
D.
E.
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