Which one is true for ATP

Options

A. ATP is prosthetic group of an enzyme
B. ATP is a coenzyme
C. ATP is an enzyme
D. ATP is the organic ion of enzyme.

Answer

To determine which statement is true regarding ATP (adenosine triphosphate), we need to analyze the given options one by one:

### Step-by-Step Solution:

1. **Understanding ATP**: ATP is a nucleotide composed of three main components: a ribose sugar (a pentose), adenine (a nitrogenous base), and three phosphate groups. It plays a crucial role in cellular energy transfer.

2. **Evaluating the Options**:
- **Option 1: ATP is a prosthetic group of an enzyme**: Prosthetic groups are tightly bound to enzymes and are not released during the reaction. ATP does not fit this definition as it is not permanently attached to enzymes.

- **Option 2: ATP is a coenzyme**: Coenzymes are organic molecules that assist enzymes in catalyzing reactions. ATP is indeed involved in many biochemical reactions, providing the necessary energy for these processes. Therefore, this statement is true.

- **Option 3: ATP is an enzyme**: Enzymes are biological catalysts that speed up chemical reactions. ATP does not catalyze reactions; instead, it provides energy for them, so this statement is false.

- **Option 4: ATP is the organic ion of an enzyme**: This statement is misleading. While ATP can interact with enzymes, it is not classified as an organic ion. Instead, it is a nucleotide that acts as a coenzyme.

3. **Conclusion**: Based on the analysis, the correct answer is that ATP is a coenzyme (Option 2).

### Final Answer:
**The correct statement is: ATP is a coenzyme. (Option 2)**

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