
Unit 6 Ch 17
Quiz
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Professional Development
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Professional Development
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Practice Problem
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Easy
Magi F
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A repressible operon in bacteria codes for the genes required to produce the amino acid serine. Serine functions as a corepressor for the operon. If serine is present in the bacteria's environment, which of the following is most likely?
increased digestion of serine
increase in the levels of serine
increased production of the repressor protein
increased binding of the repressor protein to the operator
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The arabinose operon is an inducible operon that codes for the genes required to digest the sugar arabinose. Arabinose functions as an inducer molecule for the operon. If arabinose is present in the bacteria's environment, which of the following is most likely?
increased digestion of arabinose
increase in the levels of arabinose
increased production of the repressor protein
increased binding of the repressor protein to the operator
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which sequences in bacterial operons are noncoding sequences?
operators and promoters only
operators, promoters, and genes for regulatory proteins
operators, promoters, and genes for structural proteins
promoters, genes for regulatory proteins, and genes for structural proteins
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following is a key difference between inducible operons and repressible operons?
Inducible operons have promoter sequences, and repressible operons do not have promoter sequences.
Inducible operons have operator sequences, and repressible operons do not have operator sequences.
The repressor in an inducible operon can bind to the operator sequence on its own, but the repressor in a repressible operon requires a corepressor in order to bind to the operator.
In inducible operons, RNA polymerase requires the presence of a corepressor in order to bind to the promoter; in repressible operons, RNA polymerase does not require a corepressor.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Under which of the following conditions will transcription of the lac operon be at its highest level?
low glucose, low lactose
low glucose, high lactose
high glucose, low lactose
high glucose, high lactose
6.
FILL IN THE BLANK QUESTION
30 sec • 1 pt
Adding a methyl group to a DNA nucleotide is a type of ________ and will make a DNA sequence much less likely to be transcribed.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following are proteins in eukaryotes that bind to regulatory switches and upregulate gene expression?
activators
repressors
transcription factors
mediators
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