Choose the peptide that matches the abbreviation $Phe-Val-Ala$.

The most important energy carrier in all the living cells is

Given below are two statements $:$
Statement $(I):$ On hydrolysis,oligopeptides give rise to a fewer number of $\alpha$-amino acids,while proteins give rise to a large number of $\beta$-amino acids.
Statement $(II):$ Natural proteins are denatured by acids,which convert the water-soluble form of fibrous proteins to their water-insoluble form.
In the light of the above statements,choose the most appropriate answer from the options given below $:$

What is the functional group present in serine,an amino acid,in addition to $-NH_2$ and $-COOH$ groups?

Assertion : At isoelectric point,the amino acid does not migrate under the influence of an electric field.
Reason : At isoelectric point,amino acid exists as a zwitterion.

Amino acids usually exist in the form of Zwitter ions. This means that they consist of: