.......... bonds in protein structure is covalent.

Electrostatic

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Hydrogen

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Disulphide

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Van der Waal's forces

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Solution

The correct option is C Disulphide
Of the given options only disulphide bonds are a type of covalent bonds. In biomolecules, covalent bonds are stable and strong bonds. A disulphide bond is formed by reaction between two cysteine residues. A cysteine residue has a terminal sulfhydryl group which can react with similar group present on another cysteine amino acid.

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