Which among the following amino acids has the lowest molar mass?

Which of the following is $NOT$ a globular protein?

Assertion $(A)$: The denaturation of proteins can destroy all $1^{\circ}, 2^{\circ}$ and $3^{\circ}$ protein structures.
Reason $(R)$: Curdling of milk is due to denaturation of proteins.
The correct option among the following is

If the side chain group $-R$ for an amino acid is $-CH_{2}OH$,identify the amino acid from the following:

In which of the following amino acids is the $-OH$ group present?

$(A)$ Lysine	$(B)$ Serine
$(C)$ Tyrosine	$(D)$ Valine

At which $pOH$ values is the isoelectric point of an amphoteric amino acid typically found?