The primary structure of proteins is stabilized by:
Correct answer: D. Peptide bonds
- A. Disulphide bonds
- B. Hydrogen bonds
- C. Hydrophobic interactions
- D. Peptide bonds
Explanation
The primary structure of proteins is defined by the linear sequence of amino acids, which are linked by peptide bonds. These covalent bonds are formed through a dehydration reaction between the carboxyl group of one amino acid and the amino group of another, creating a stable backbone for the protein. In contrast, disulfide bonds, hydrogen bonds, and hydrophobic interactions play crucial roles in higher-level structures (secondary, tertiary, and quaternary) but do not stabilize the primary sequence.
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The chapter covers water's polarity and biological roles, carbohydrates, lipids, proteins and nucleic acids, including their monomers, bonds, structures and functions. It also distinguishes RNA from DNA and explains conjugated molecules such as glycoproteins, glycolipids and nucleoproteins, which combine organic molecules with a non-protein component.
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