Which type of junctions may protect a damaged cell through chemical gating?

#Question id: 870

#Unit 1. Molecules and their Interaction Relevant to Biology

Choose correct statements about ‘Protein Disulfide Isomerase’ in protein folding

A. Oxidized PDI catalyzes the rearrangement of a polypeptide’s non-native disulfide bonds via disulfide interchange reactions to yield native disulfide bonds.

B. Reduced PDI catalyzes the initial formation of a polypeptide’s disulfide bonds through the formation of a mixed disulfide.

C. Protein disulfide isomerase contains the conserved active site motif of Cys-Xaa-Xaa-Cys found in thioredoxin and shares a similar role to the Dsb family of proteins found in E. coli.

D. Under more reducing conditions with thiols in the active site the enzyme reshuffles disulfides (isomerase) in target proteins.

#Question id: 10587

#Unit 10. Ecological Principles

The above pyramid 

Which of the following is not representation of following ecosystem?

#Question id: 1789

#Unit 4. Cell Communication and Cell Signaling

What is negative feedback on adaptive B-cell responses mediated by

#Question id: 31020

#Unit 4. Cell Communication and Cell Signaling

#Question id: 19562

#Unit 12. Applied Biology