Unlike the trp operon, the lac operon is Question 11 options: a) inversible. b) an excision repair. c) repressible. d) inducible. e) a transposon.
Added by Margaret B.
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The trp operon is a repressible operon, meaning it is usually "on" and can be turned "off" when the end product (tryptophan) is abundant. Show more…
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The lac operon is... a) Positive repressible b) Both negative inducible and positive repressible c) Positive inducible d) Negative inducible 2. An activator regulatory protein... a) Is involved in negative regulatory control b) Is a cis-acting regulatory element c) Recruits RNA polymerase to the promoter d) Prevents RNA polymerase from binding the promoter 3) For the lac operon, the presence of the substrate (lactose) activates the repressor. True or False? a) True b) False 4) cAMP... a) Activates catabolite activator protein (CAP) b) Deactivates the repressor c) Activates the repressor d) Activates RNA Polymerase 5) For the lac operon, when glucose is absent and lactose is absent a) There is reduced transcription of the structural genes b) There is enhanced transcription of the structural genes c) None of the above d) Transcription is turned off 6) For the lac operon, when glucose is present and lactose is present a) None of the options b) cAMP-CAP is bound to the promoter and the repressor is bound to the operator c) cAMP-CAP is not bound to the promoter and the repressor is not bound to the operator d) cAMP-CAP is bound to the operator and the repressor is bound to the promoter
Adi S.
An operon of genes encoding enzymes in a biosynthetic pathway is likely to be which of the following? a. inducible b. repressible c. constitutive d. monocistronic
The present question is normally about the trp operon. The lac operon is another example of an inducible operon. The repressor in the trp operon is normally bound to tryptophan. The operon is regulated by a repressor protein.
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