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A protein that has three helical polypep...

A protein that has three helical polypeptides supercoiled to form a rope like structure is

A

Insulin

B

Collagen

C

Haemoglobin

D

Both (1) & (3)

Text Solution

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The correct Answer is:
To solve the question, "A protein that has three helical polypeptides supercoiled to form a rope-like structure is," we will analyze the options provided and the characteristics of each protein mentioned. ### Step-by-Step Solution: 1. **Understanding the Structure of Proteins**: - Proteins are made up of polypeptide chains that can have various structures: primary, secondary, tertiary, and quaternary. - The question specifically mentions a "rope-like structure" formed by "three helical polypeptides." 2. **Analyzing the Options**: - **Insulin**: Insulin is composed of two peptide chains (A and B chains) linked by disulfide bonds. It does not have a helical structure or a rope-like formation. - **Collagen**: Collagen is known for its triple helix structure, consisting of three polypeptide chains that are coiled together. This structure resembles a rope and is right-handed. - **Hemoglobin**: Hemoglobin consists of four polypeptide chains (two alpha and two beta chains). While it has a quaternary structure, it does not consist of three helical polypeptides forming a rope-like structure. 3. **Identifying the Correct Answer**: - Based on the analysis, collagen is the protein that fits the description of having three helical polypeptides that supercoil to form a rope-like structure. 4. **Conclusion**: - Therefore, the correct answer to the question is **Collagen**. ### Final Answer: The protein that has three helical polypeptides supercoiled to form a rope-like structure is **Collagen**. ---
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