Bonds present in the alpha helix are:
Correct answer: A. Hydrogen bonds
- A. Hydrogen bonds
- B. Disulfide linkage
- C. Ionic bonds
- D. Peptide bonds
Explanation
The alpha helix is a common secondary structure in proteins, stabilized by hydrogen bonds. These bonds form between the carbonyl oxygen of one amino acid and the amide hydrogen of another, typically four residues apart. This bonding pattern results in a coiled, helical structure. Disulfide linkages, while stabilizing tertiary structures, are not involved in the alpha helix. Ionic bonds are interactions between charged side chains, and peptide bonds connect the amino acids but do not stabilize the alpha helix directly.
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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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