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: 428

#Unit 1. Molecules and their Interaction Relevant to Biology

The most biochemically complex organisms are ________.

TLS Online TPP Program

#Question id: 33110

#Unit 1. Molecules and their Interaction Relevant to Biology

When substrate fit into enzyme active site

TLS Online TPP Program

#Question id: 4578

#Unit 11. Evolution and Behavior

Which definition of evolution would have been most foreign to Charles Darwin during his lifetime? 

TLS Online TPP Program

#Question id: 23165

#Unit 13. Methods in Biology

For visualizing two proteins which are localized in nucleus through fluorescence microscopy which two sets of dyes can be best used for clear visual?

TLS Online TPP Program

#Question id: 4658

#Unit 11. Evolution and Behavior

Members of two different species possess a similar-looking structure that they use in a similar fashion to perform the same function. Which information would best help distinguish between an explanation based on homology versus one based on convergent evolution?