Question

The helical structure of protein is stabilized by

• A. Hydrogen bonds
• B. Ether bonds
• C. Peptide bonds
• D. Dipeptide bonds

Answer 1

The Correct Option is A

The question asks about the stabilization structure of proteins, specifically the helical structure. Understanding this involves a basic knowledge of protein chemistry and the types of bonds that stabilize protein structures.

The helical structure of a protein, often referred to as an alpha helix, is a common structural motif in proteins. This structure is stabilized primarily by:

Explanation of Helical Structure Stabilization

• Alpha Helices: These are a type of secondary structure found in proteins. In an alpha helix, the amino acid chain is coiled in a right-handed manner, and the structure is held together by hydrogen bonds.
• Hydrogen Bonds: Within the alpha helix, the carbonyl (C=O) group of an amino acid forms a hydrogen bond with the amide (N-H) group of another amino acid four residues earlier in the chain. These hydrogen bonds are crucial as they hold the helix in its coiled structure and provide stability.

Now, let's analyze the options given:

1. Hydrogen bonds: As discussed, these are responsible for the stabilization of the helical structure in proteins. Hence, this is the correct answer.
2. Ether bonds: These are not typically found in proteins; they occur primarily in lipids.
3. Peptide bonds: While peptide bonds (formed between amino acids) are essential for the primary structure of proteins, they do not stabilize the helical formation specifically.
4. Dipeptide bonds: This is not a standard term used in protein chemistry. The term 'dipeptide' usually refers to a molecule consisting of two linked amino acids, not a stabilizing bond in protein helices.

Hence, the correct answer is: Hydrogen bonds.