Which vitamins is incorporated into the structure of NAD/NADP?

Options

A. Riboflavin
B. Vitamin PP
C. Nicotinic acid
D. All correct

Answer

To answer the question regarding which vitamin is incorporated into the structure of NAD (Nicotinamide Adenine Dinucleotide) and NADP (Nicotinamide Adenine Dinucleotide Phosphate), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Components of NAD and NADP**:
- NAD and NADP are both coenzymes involved in various biochemical reactions, particularly in cellular respiration and metabolism.

2. **Understand the Structure**:
- NAD is composed of two nucleotides joined by their phosphate groups. One of these nucleotides contains nicotinamide, which is crucial for the function of NAD.

3. **Determine the Vitamin Source**:
- The nicotinamide in NAD and NADP is derived from Vitamin B3, which is also known as niacin.

4. **Recognize the Relationship**:
- Vitamin B3 (niacin) can exist in two forms: nicotinic acid and nicotinamide. The form incorporated into NAD and NADP is nicotinamide.

5. **Conclusion**:
- Therefore, the vitamin incorporated into the structure of NAD and NADP is Vitamin B3, specifically in the form of nicotinamide.

### Final Answer:
The vitamin incorporated into the structure of NAD and NADP is Vitamin B3, also known as nicotinic acid or niacin.

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