A globular protein consisting of more than one polypeptide chains has:
Correct answer: D. Quaternary structure
- A. Primary structure
- B. Tertiary structure
- C. Secondary structure
- D. Quaternary structure
Explanation
The quaternary structure of a protein refers to the arrangement of multiple polypeptide chains (subunits) to form a functional protein complex. In some globular proteins, two or more polypeptide chains come together and interact through various forces like hydrogen bonding, disulfide bridges, and hydrophobic interactions to form a larger functional unit. This overall arrangement of multiple subunits constitutes the quaternary structure.
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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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