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Regulatory Proteins: Regulation by Repression

View the animation below, then complete the quiz to test your knowledge of the concept.

1A repressor protein...
A)binds to the DNA molecule and prevents transcription.
B)binds to the RNA polymerase preventing messenger RNA synthesis.
C)is unable to bind to the DNA molecule and prevent transcription.
D)is a structural protein.
E)is made in the absence of glucose.

2When a microorganism such as E. coli is grown on glucose...
A)it is unable to produce ATP.
B)it is capable of amino acid production.
C)it is incapable of amino acid production.
D)it is unable to produce its peptidoglycan layer.
E)it is unable to synthesize a cell wall.

3Which of the following is not true for activators?
A)Activators bind directly to the DNA.
B)Activators must react with the substrate that they regulate before binding with DNA.
C)The activator cannot bind to the DNA in the absence of an inducer.
D)Activators regulate some degradative pathways.
E)Activators facilitate transcription.

4Some degradative pathways are regulated by an activator protein. An activator is a regulatory protein that facilitates transcription by binding to DNA.

5Regulation of degradative pathways involving an activator that is activated by an inducer is referred to as positive control.

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