In a dinucleotide, number of ester bonds formed between the two nucleotides is

Options

A. 1
B. 2
C. 3
D. 4

Answer

To determine the number of ester bonds formed between two nucleotides in a dinucleotide, we can break down the process step by step.

### Step-by-Step Solution:

1. **Understanding Dinucleotide**:
- A dinucleotide consists of two nucleotides linked together. Each nucleotide is made up of a sugar, a phosphate group, and a nitrogenous base.

2. **Formation of Ester Bonds**:
- An ester bond is formed between the phosphate group of one nucleotide and the sugar of another nucleotide. This is a key point in understanding how nucleotides connect to form a dinucleotide.

3. **Identifying Bonds in Dinucleotide**:
- In a dinucleotide, there is one ester bond formed between the 5' phosphate group of the first nucleotide and the 3' hydroxyl group of the sugar of the second nucleotide.

4. **Conclusion**:
- Since there is only one ester bond formed between the two nucleotides in a dinucleotide, the answer is that the number of ester bonds formed is **one**.

### Final Answer:
The number of ester bonds formed between the two nucleotides in a dinucleotide is **one**.