Poion of immunoglobulin molecule with molecular weight of 50,000-
**Core Concept**
The **immunoglobulin molecule** is composed of heavy and light chains, which are crucial for its function in the immune system. The portion of the immunoglobulin molecule with a molecular weight of 50,000 is significant for understanding its structure and function. This molecular weight corresponds to a specific part of the immunoglobulin.
**Why the Correct Answer is Right**
The correct answer is related to the **light chain** of the immunoglobulin molecule, which has a molecular weight of approximately 50,000. The light chain is one of the two types of chains that make up an immunoglobulin, the other being the heavy chain. The light chain is composed of a variable region and a constant region, and it plays a key role in the antigen-binding site of the immunoglobulin.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the molecular weight mentioned does not correspond to the heavy chain.
**Option B:** This is not the correct portion of the immunoglobulin molecule with the given molecular weight.
**Option D:** This option does not match the molecular weight of 50,000.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that the light chain of an immunoglobulin has a molecular weight of approximately 50,000, which is a key fact for understanding immunoglobulin structure and function.
**Correct Answer:** C. Light chain