Which of these options is categorized as a lectin ?

Options

A. Abrin
B. Ricin
C. Concanavalin A
D. None of these

Answer

To determine which of the provided options is categorized as a lectin, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Definition of Lectins**:
- Lectins are proteins that bind to carbohydrates. They are classified as secondary metabolites produced by plants and play roles in various biological processes, including defense mechanisms.

2. **Review the Options**:
- The options provided are:
- A) Abrin
- B) Resin
- C) Concanavalin A
- D) None of these

3. **Analyze Each Option**:
- **A) Abrin**: This is a toxic protein derived from the seeds of the Abrus precatorius plant. It is not classified as a lectin.
- **B) Resin**: This is a sticky substance produced by some plants, primarily for protection. It is not a lectin.
- **C) Concanavalin A**: This is a well-known lectin derived from the jack bean (Canavalia ensiformis). It specifically binds to certain carbohydrates and is used in various biochemical applications.
- **D) None of these**: This option implies that none of the previous options are lectins, which is incorrect since Concanavalin A is a lectin.

4. **Identify the Correct Answer**:
- Based on the analysis, the only option that is categorized as a lectin is **C) Concanavalin A**.

### Final Answer:
**C) Concanavalin A**

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