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Question

Which of the following is an example of alkaline amino acid?

A
Lysine
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B
Aspartate
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C
Alanine
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D
Valine
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Solution

The correct option is A Lysine
Amino acids can be classified based on the number of carboxylic groups and amino groups present in them.

(A) Acidic amino acids: They have one amino group and two carboxylic groups in their structure.


E.g: Aspartate and glutamate

(B) Alkaline amino acids: They have two amino groups and one carboxylic group.

Net charge = +ve
E.g: Histidine, arginine, lysine

(C) Neutral amino acids: They have one amino and one carboxylic group. They are present in the form of zwitter ion.
E.g: Alanine, valine

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