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Which is not a true statement?

1. α-Carbon of α-amino acid is asymmetric
2. All proteins are found in L-form
3. Human body can synthesize all proteins they need
4. At pH = 7 both amino and carboxylic groups exist in ionised form

Correct answer: Human body can synthesize all proteins they need

Solution

The human body cannot synthesize all proteins it needs; some essential amino acids must be obtained from the diet. This makes option C incorrect.

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