First slide

Amino acids

Question

Statement-I: Amino acids are insoluble in water
Statement-II: A dipeptide contains two amino acid residues.

Moderate

A

Both statements I and II are correct
B

Statement-I is correct and statement-II is incorrect
C

Statement-I is incorrect and statement-II is correct
D

Both statements I and II are incorrect

Solution

Amino acids exist as Zwitter ions. They are crystalline and soluble in water.
$H_{3} \overset{+}{N} - \underset{\overset{|}{R}}{C} H - {COO}^{-} (Zwitter ion) H_{2} N - \underset{\overset{|}{R}}{C} H - CO - NH - \underset{\overset{|}{R}}{C} H - COOH (Dipeptide)$
Dipeptide has two amino acid residues with only one peptide bond.

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