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

The total number of negative charges in the tetrapeptide,$Gly-Glu-Asp-Tyr$,at $pH$ $12.5$ will be $......$ .

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

Which of the following is the correct structure of $L$-alanine?

Identify the correct set of functional groups present in aspartame,an artificial sweetener.

Total number of essential amino acids among the given list of amino acids is . . . .
Arginine,Phenylalanine,Aspartic acid,Cysteine,Histidine,Valine,Proline