Which statements about a peptide bond are correct? 1 It joins two monomers which are always identical to each other. 2 It contains four different atoms. 3 It can be broken by the addition of water at room temperature. 4 It is important in the primary structure of proteins.

PROTEINS

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

A	A 1, 2 and 3
B	B 1 and 3 only
C	C 2, 3 and 4
D	D 2 and 4 only

Explanation:

Detailed explanation-1: -The peptide bond longer than average C=N double bond. (A) The peptide bonds have partial double character due to resonance, which decreases the bond length of C-N in a peptide bond. This suggests that the C-N bond in a peptide is shorter than the C-N single bond. Hence, statement (A) is correct.

Detailed explanation-2: -Peptide bonds link monomers in a polymer. It is formed out of dehydration, that is, the amino group and carboxyl group of two different amino acids react to give rise to peptide bonds.

Detailed explanation-3: -A peptide bond is a planar, trans and rigid configuration. It also shows a partial double bond character. The coplanarity of the peptide bond denotes the resonance or partial sharing of two pairs of electrons between the amide nitrogen and carboxyl oxygen.

Detailed explanation-4: -Solution : Due to resonance, C-N bond length in proteins is smaller than usual bond length of ‘C-N‘ bond. Therefore, option (a) is incorrect. Step by step solution by experts to help you in doubt clearance & scoring excellent marks in exams.

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BIOMOLECULES AND ENZYMES

BIOLOGY

PROTEINS