Question

Which of the following are correct with reference to amino acid?
a. Amphoteric in nature
b. Are substituted methane molecules
c. Serine is an alcoholic amino acid.
d. Amino acids never exist in zwitterionic form at any stage in living cells.
e. A dipeptide comprises two peptide bonds between amino acids.
A. a, b, c
B. a,d,e
C. b, c, d
D. a,c,d, e

Answer 1

Amino acids are organic compounds that contain amino alkane and carboxylic practical groups, facet conjunction with|beside|at the side of| with} a side chain specific to every amino acid. The key components of an associated amino acid are carbon, hydrogen, oxygen, and element, though different components are found within the aspect chains of bound amino acids.

Complete answer:
Amino acids are the organic compounds that have a chemical group, associated radical, associated with an organic R-group. These are the building blocks of proteins. Amino acids will act as associate acid and as a base, in order that they are amphoteric. The chemical group of associate amino acid loses associate negatron and therefore the radical accepts that electron. so, there happens to be a couple of charges on an equivalent molecule however the overall charge remains neutral. Such a molecule is named zwitter particle.
Amino acids are substituted alkane series molecules the four substituent teams connected on the alpha carbon offer the four valency positions.
An amino acid is an associated alcoholic amino acid.
Amino acids exist as zwitter particles at the hydrogen ion concentration starting from two to nine in living tissues.
A dipeptide is created from 2 amino acids connected through one chemical bond.
Hence, the proper answer is 'a,b,c'
So, A is the correct option.

Note: An amino acid has each a basic aminoalkane cluster associated with an acidic acid cluster. there's an inside transfer of a {hydrogen particle|proton|cation} from the -COOH cluster to the -NH2 cluster to depart associate ion with each an electric charge and an electric charge. This is often known as a zwitterion.