This structural level of proteins is maintained by ionic, hydrogen and disulphide bonds:
Correct answer: C. Tertiary structure
- A. Primary structure
- B. Secondary structure
- C. Tertiary structure
- D. Quaternary structure
Explanation
The correct answer is the tertiary structure. Tertiary structure is the overall three-dimensional shape of a single protein molecule, and it is stabilized by various interactions, including ionic bonds, hydrogen bonds, and disulfide bridges. These bonds are crucial for maintaining the protein's functional shape. In comparison, primary structure is solely about the amino acid sequence, secondary structure involves regular patterns like alpha helices and beta sheets stabilized by hydrogen bonds, and quaternary structure refers to the arrangement of multiple protein subunits, which can include similar interactions as tertiary structure but also others like hydrophobic interactions.
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About Biological Molecules
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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