#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: 32524
#Unit 1. Molecules and their Interaction Relevant to Biology
#Question id: 1532
#Unit 4. Cell Communication and Cell Signaling
For a particular microarray assay (DNA chip), cDNA has been made from the mRNAs of a dozen patients' breast tumor biopsies. Which of the following types of evidence will researchers be looking for in order to determine if the cells are cancerous?
#Question id: 24327
#Unit 4. Cell Communication and Cell Signaling
#Question id: 4347
#Unit 3. Fundamental Processes
According to the lac operon model proposed by Jacob and Monod, what is predicted to occur if the operator is removed from the operon?