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Due to resonance C—N bond in protein acquires double bond character and is smaller than usual C—N bond.

1. Essential amino acids are supplied to our bodies by food which we take because they cannot be synthesised in the body. These are (i) valine (ii) leucine (iii) Isoleucine (iv) Phenylalanine (v) Threonine (vi) Methionine (vii) Lysine (viii) Tryptophan (ix) Arginine (x) Histidine.
2. There are 20 amino acid in man, out of which 10 amino acids are essential amino acids.
3. Due to resonance C—N bond in protein acquires double bond character and is smaller than usual C—N bond.
4. All proteins are not found in L-form but they may be present in form of D or L.

Correct answer: Due to resonance C—N bond in protein acquires double bond character and is smaller than usual C—N bond.

Solution

Option C is correct because the resonance in the peptide bond of proteins leads to partial double-bond character in the C—N bond, making it shorter than a typical single C—N bond.

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