Usually a polypeptide chain bends and folds upon itself to form a globular shape. This is protein's:
Correct answer: B. Tertiary structure
- A. Primary structure
- B. Tertiary structure
- C. Secondary structure
- D. Quaternary structure
Explanation
The correct answer is the tertiary structure because it represents the complete three-dimensional folding of a single polypeptide chain into a globular shape, which is essential for its function and stability. The primary structure only details the sequence of amino acids, while the secondary structure includes local folding patterns like alpha-helices and beta-sheets. Quaternary structure is relevant only for proteins with multiple polypeptide subunits.
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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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