List of top Zoology Questions on Proteins asked in CUET (PG)

True statements about collagen: A. Triple-stranded helical structure
B. Repeating tripeptide Gly-X-Y
C. ‘a chains' are right-handed helix
D. Glycine permits sharp twisting
E. Ascorbic acid is required for proline hydroxylation

Assertion (A): Isoelectric focusing (IEF) is a highly sensitive analytical technique particularly useful for studying micro-heterogeneity in a protein. Reason (R): A protein may show a single band on SDS gel, but three bands on an IEF gel. The method is useful for separating isoenzymes.