A basic immunoglobulin molecule is composed of how many polypeptide chains?

• A. Two polypeptide chains
• B. Eight polypeptide chains
• C. Four polypeptide chains
• D. Six polypeptide chains

Answer: (C)

Verified step by step guidance

1. Understand the structure of an immunoglobulin molecule, which is a type of antibody.
2. Recognize that a basic immunoglobulin molecule is composed of two types of polypeptide chains: heavy chains and light chains.
3. Each immunoglobulin molecule typically consists of two identical heavy chains and two identical light chains.
4. Add the number of heavy chains and light chains together: 2 heavy chains + 2 light chains.
5. Conclude that the total number of polypeptide chains in a basic immunoglobulin molecule is four.