#Question id: 3981
#Unit 3. Fundamental Processes
The diagram below represents a hypothetical operon in the bacterium E. coli. The operon consists of two structural genes (A and B), which code for the enzymes A-ase and B-ase, respectively, and also includes P (promoter) and O (operator) regions as shown.
When a certain compound (X) is added to the growth medium of E. coli, the separate enzymes A-ase and B-ase are both synthesized at a 50-fold higher rate than in the absence of X. (X has a molecular weight of about 200.) Which of the following statements is true of the operon decribed above?
#Question id: 3982
#Unit 3. Fundamental Processes
The diagram below represents a hypothetical operon in the bacterium E. coli. The operon consists of two structural genes (A and B) that code for the enzymes A-ase and B-ase, respectively, and also includes P (promoter) and O (operator) regions as shown.
When a certain compound (X) is added to the growth medium of E. coli, the separate enzymes A-ase and B-ase are both synthesized at a 50-fold higher rate than in the absence of X (which has a molecular weight of about 200). Which one of the following statements is true of such an operon?
#Question id: 3983
#Unit 3. Fundamental Processes
Transcription of the lactose operon in E. coli is stimulated by:
#Question id: 3984
#Unit 3. Fundamental Processes
Which of the following statements about regulation of the lac operon is true?
#Question id: 3985
#Unit 3. Fundamental Processes
The binding of CRP (cAMP receptor protein of E. coli) to DNA in the lac operon:
#Question id: 3986
#Unit 3. Fundamental Processes
Consider the lac operon of E. coli. When there is neither glucose nor lactose in the growth medium: