# NEET Zoology Biomolecules Questions Solved

BOARD

Amino acids may be acidic, alkaline or neutral. How does this happen ? What are essential and non-essential amino acids ? Name one of each type.            (3 marks)

Amino acids can be boardly classified into three classes i.e., acidic, alkaline and neutral amino acids depending on the number of $-{\mathrm{NH}}_{2}$ group and $-\mathrm{COOH}$ group.

Acidic amino acids : Those $\mathrm{\alpha }$-amino acids such as aspartic acid, asparagine and glutamic acid which contain two $-\mathrm{COOH}$ groups and one $-{\mathrm{NH}}_{2}$ group are called acidic amino acids.

Alkaline or Basic amino acids : Those $\mathrm{\alpha }$-amino acids such as lysine, arginine and histidine which contain two $-{\mathrm{NH}}_{2}$ groups and one $-\mathrm{COOH}$ group, are called basic amino acids.

Neutral amino acids : Those $\mathrm{\alpha }$-amino acids such as glycine, alanine, valine etc. which contain one $-{\mathrm{NH}}_{2}$ and one $-\mathrm{COOH}$ group, are called netural amino acids.

Essential and non-essential amino acids :

Essential amino acids : Amino acids which the body cannot synthesize are called essential amino acids.

Example : Valine, leucine etc. Therefore they must be supplied in diet.

Non-essential amino acids : Amino acids which the body can synthesize are called non-essential amino acids. Therefore, they may or may not be present in diet.

Example : Glycine, alanine etc.

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