Among keratin, myosin, collagen, albumin and myoglobin, total number of globular proteins is______.

Which of the following pairs of the compound are epimers?

$\left(\mathrm{a}\right)$ Glucose and mannose

$\left(\mathrm{b}\right)$ Mannose and galactose

$\left(\mathrm{c}\right)$ Glucose and galactose

$\left(\mathrm{d}\right)$ Mannitol and sorbitol

Which of the statements about 'denaturation' given below are correct?

Statements:

($\mathrm{i}$) Denaturation of proteins causes loss of secondary and tertiary structures of the protein.

($\mathrm{ii}$) Denaturation leads to the conversion of double strand of $\mathrm{DNA}$ into single strand.

($\mathrm{iii}$) Denaturation affects the primary structure, which gets destroyed.