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Pre-Test
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1
In bacteria, transcriptional regulation by ________ proteins is called ________ control.
A)repressor; negative
B)activator; negative
C)repressor; positive
D)small; micro
E)constitutive; feedback
2
Which one of the following contributes to the control of eukaryotic gene expression?
A)Activator proteins
B)Repressor proteins
C)Effector molecules
D)DNA methylation
E)All of the above contribute to combinatorial control in eukaryotes.
3
Which of the following is an example of genetic regulation?
A)E. coli increases expression of beta-galactosidase in response to lactose in the growth medium.
B)The cells in a developing fetus synthesize different proteins depending on the stage in development.
C)Brain cells produce a different set of proteins than muscle cells.
D)A cell has encountered DNA damage and expresses a set of repair proteins to fix the damage.
E)All of the above are examples of genetic regulation.
4
Under which of the following conditions would lac operon expression in E. coli be maximal?
A)High levels of glucose, low levels of lactose
B)Low levels of glucose, high levels of lactose
C)High levels of glucose, high levels of lactose
D)Low levels of glucose, low levels of lactose
E)None of the above are correct.
5
Tryptophan acts as an inducer of the trp operon by binding to the trp repressor protein, releasing it from the trp operator.
A)True
B)False





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