The type of bond formed between hydroxyl group of sugar and phosphate is

Options

A. Ester bond
B. Glycosidic
C. Peptide bond
D. All the above

Answer

To determine the type of bond formed between the hydroxyl group of sugar and phosphate, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Functional Groups**:
- The hydroxyl group (-OH) is a functional group found in sugars.
- Phosphate (PO4) is a functional group that contains phosphorus and oxygen.

2. **Understand the Bonding Context**:
- In nucleotides, which are the building blocks of nucleic acids (DNA and RNA), the sugar (ribose or deoxyribose) is linked to a phosphate group.

3. **Determine the Type of Bond**:
- When the hydroxyl group of the sugar reacts with the phosphate group, a chemical reaction occurs where a water molecule is released (a dehydration reaction).
- This reaction results in the formation of an ester bond.

4. **Clarify the Types of Bonds**:
- **Ester Bond**: This is formed when an alcohol (the hydroxyl group of sugar) reacts with an acid (the phosphate group).
- **Glycosidic Bond**: This is a bond between two sugar molecules, not relevant here.
- **Peptide Bond**: This is formed between amino acids, also not relevant here.

5. **Conclusion**:
- Therefore, the bond formed between the hydroxyl group of sugar and the phosphate group is an **ester bond**.

### Final Answer:
The type of bond formed between the hydroxyl group of sugar and phosphate is an **ester bond**.

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