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There are four levels of protein structure. These figures show primary, secondary, tertiary, and quaternary protein structure. Which level(s) of protein structure may be stabilized by covalent bonds?


A. None of the levels of protein structure is stabilized by covalent bonds.

B. Secondary level of protein structure

C. Primary, tertiary and quaternary levels of protein structure

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Answer:

C) Primary, tertiary and quaternary levels of protein structure

Explanation:

Primary structure; Covalent bond is present in form of peptide bond in the primary structuture of proteins. The amino acids are held together in the polypeptide chain by peptide bond.

Tertiary structure; Disulfide bonds are present between cysteine amino acids, that keeps the parts of polypeptide chain strongly attached to one another.

Quaternary structure; The Quaternary structure of protein is held together by hydrophobic interaction and disulfide bonds.

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