Imagine that you have created a fusion between the Trp operon, which encodes the enzymes for tryptophan biosynthesis, and the Lac operon, which encodes the enzymes necessary for lactose utilization. Under which set of conditions (A–F below) will β-galactosidase be expressed in the strain that carries the fused operon?

A. Only when lactose and glucose are both absent.

B. Only when lactose and glucose are both present.

C. Only when lactose is absent and glucose is present.

D. Only when lactose is present and glucose is absent.

E. Only when tryptophan is absent.

F. Only when tryptophan is present.

TLS Online TPP Program

#Question id: 3880

#Unit 3. Fundamental Processes

Which one of the following properties of the L-19 IVS ribozyme is not shared with enzymes that are purely protein?

TLS Online TPP Program

#Question id: 420

#Unit 1. Molecules and their Interaction Relevant to Biology

The structure of NAD+ does not include:

TLS Online TPP Program

#Question id: 1244

#Unit 4. Cell Communication and Cell Signaling

Which type of experimental evidence shows that the intrinsic GTPase activity of the Gα subunit is important for terminating effector activation?

TLS Online TPP Program

#Question id: 21813

#Unit 12. Applied Biology

Which one of the following sensors measures acceleration and vibration?

TLS Online TPP Program

#Question id: 12023

#Unit 7. System Physiology – Animal

The absorption of fats differs from that of carbohydrates in that ________.