In ATP high energy bond occurs between

Options

A. Phosphate and phosphate
B. Ribose and Phosphate
C. Adenine and phosphate
D. Adenine and ribose.

Answer

To answer the question about where the high energy bond occurs in ATP, we can follow these steps:

### Step 1: Understand the Structure of ATP
ATP, or adenosine triphosphate, is a nucleotide that consists of three main components:
- A ribose sugar (a 5-carbon sugar)
- A nitrogenous base (adenine)
- Three phosphate groups

### Step 2: Identify the Types of Bonds in ATP
In ATP, there are two types of bonds:
1. **Phosphoester Bonds**: These bonds occur between the ribose sugar and the phosphate groups. They are considered low energy bonds.
2. **Phosphoanhydride Bonds**: These bonds occur between the phosphate groups themselves. They are considered high energy bonds.

### Step 3: Determine the High Energy Bonds
The high energy bonds in ATP are specifically the phosphoanhydride bonds that occur between the phosphate groups. This means that the bond that provides the most energy upon hydrolysis is the bond between the phosphate groups.

### Step 4: Analyze the Options
Given the options:
1. Phosphate and phosphate
2. Ribose and phosphate
3. Adenine and phosphate
4. Adenine and ribose

The correct answer is option 1: **Phosphate and phosphate**, as this is where the high energy bonds (phosphoanhydride bonds) are located.

### Conclusion
Thus, the high energy bond in ATP occurs between the phosphate groups.

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