A protein domain a) cannot have beta sheets. b) can fold only in the presence of the rest of the protein. c) is always composed of multiple peptides. d) can be disordered.

Ans…
a) is false. Protein domains can have beta barrel.
b) is also false. Protein domains are autonomous structures and can fold independently.
c) is false. It is not compulsory that a protein domain should contain multiple peptides. It can be a single peptide also.
d) is true. Disordered proteins have disordered protein domains; these proteins have long lifetime.