What type of bonding in proteins maintains the integrity of the helical secondary structure?
Correct answer: A. Hydrogen bonds
- A. Hydrogen bonds
- B. Ionic bonds
- C. Disulphide bonds
- D. Both A and B
Explanation
The correct answer is Option A: Hydrogen bonds. Hydrogen bonds are crucial for maintaining the integrity of the secondary structure of proteins, such as the alpha-helix. They form between the carbonyl oxygen of one amino acid and the amide hydrogen of another, stabilizing the helical structure. Option B is incorrect, as ionic bonds are more relevant to the tertiary structure of proteins. Option C is incorrect because disulfide bonds stabilize tertiary, not secondary, structures. Option D is incorrect because it includes ionic bonds, which do not play a primary role in helical secondary structures.
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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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