A vector contains the nitR gene under the control of the nitA promoter in a separate operon, the expression of vector is used, upon the addition of the inducer. The inducer–NitR protein complex activates the transcription of both the target gene(s) and nitR and increased level of NitR results in a very high level of production of the target protein(s). Which type of inducer using by nitR?

#Question id: 1424

#Unit 4. Cell Communication and Cell Signaling

Gain-of-function mutations in which of the following genes typify colorectal carcinomas?

#Question id: 10992

#Unit 7. System Physiology – Animal

When recording lead aVL on an EKG, the positive electrode is the

#Question id: 885

#Unit 1. Molecules and their Interaction Relevant to Biology

The half-lives of many cytoplasmic proteins vary with the identities of their N-terminal residues via the  N-end rule.

a) Proteins with the “destabilizing” N-terminal residues contain Asp, Arg, Leu, Lys, and Phe with their half-lives > 2 to 3 hours

b) Proteins with the “destabilizing” N-terminal residues with their half-lives of only 2 to 3 minutes contain; Asp, Arg, Leu, Lys, and Phe

c) Proteins contain Ala, Gly, Met, Ser, Thr, and Val have half-lives of >10 hours are stabilizing N-terminal residue in prokaryotes

d) Those with the “stabilizing” N-terminal residues Ala, Gly, Met, Ser, Thr, and Val have half-lives of >20 hours in eukaryotes

Which of the following is correct?

#Question id: 2526

#Unit 2. Cellular Organization

cell walls essential and are important features of plant cells that perform a number of essential functions. Which of the following is not the characteristics of cell wall?

#Question id: 2660

#Unit 2. Cellular Organization

In the lactose operon, the molecule that causes the repressor to fall off the promoter is which of the following?