Protein folding is done by:

Ans (a) ChaperoneRef; Harper's Biochemistry, 26th ed. pg. 36-37* Chaperone proteins participate in the folding of over half of mammalian proteins. The hsp70 (70-kDa heat shock protein) family of chaperones binds short sequences of hydrophobic amino acids in newly synthesized polypeptides, shielding them front solvent.