Which of the following is coenzyme -II ?

Options

A. NAD
B. NADP
C. FAD
D. None of the above

Answer

To solve the question "Which of the following is coenzyme -II?" we will analyze the options provided and identify the correct answer step by step.

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for the identification of coenzyme -II among the given options: NAD, NADP, FAD, or none of the above.

2. **Define Coenzymes**: Coenzymes are organic molecules that assist enzymes in catalyzing reactions. They often act as carriers for chemical groups or electrons.

3. **Examine the Options**:
- **NAD (Nicotinamide Adenine Dinucleotide)**: This is a coenzyme involved in redox reactions, carrying electrons from one reaction to another. However, it is not referred to as coenzyme -II.
- **NADP (Nicotinamide Adenine Dinucleotide Phosphate)**: This is similar to NAD but has an additional phosphate group. It plays a crucial role in anabolic reactions, such as lipid and nucleic acid synthesis. It is known as coenzyme -II.
- **FAD (Flavin Adenine Dinucleotide)**: This is another coenzyme involved in redox reactions, but it is not coenzyme -II.
- **None of the Above**: This option implies that none of the listed coenzymes are coenzyme -II, which is incorrect since NADP is.

4. **Identify the Correct Answer**: Based on the definitions and roles of the coenzymes, NADP is identified as coenzyme -II.

5. **Conclusion**: The correct answer to the question is **NADP**.

### Final Answer:
**NADP** is coenzyme -II.