Which of the following is an important secondary structure in proteins?
Correct answer: C. Both A and B
- A. α-helix
- B. β-pleated sheets
- C. Both A and B
- D. Salt bridges
Explanation
The correct answer is both α-helix and β-pleated sheets since they are the two major types of secondary structure in proteins. These structures are stabilized by hydrogen bonds between the backbone atoms in the polypeptide chain. The α-helix is a right-handed coil, while β-pleated sheets consist of β-strands connected laterally by hydrogen bonds. Salt bridges are not part of the secondary structural elements; they contribute to the tertiary structure by stabilizing the overall three-dimensional shape of the protein.
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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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