Bond present between two residues of carbohydrate is

Options

A. Amide
B. Phosphodiester
C. Glycosidic
D. Hydrogen bond.

Answer

To determine the bond present between two residues of carbohydrates, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Types of Bonds**: The question asks about the bond between two carbohydrate residues. The options provided are amide, phosphodiester, glycosidic, and hydrogen bond.

2. **Understand Carbohydrate Structure**: Carbohydrates are organic molecules made up of sugar units (monosaccharides). When two monosaccharides join together, they form a disaccharide.

3. **Determine the Bond Formation**: The bond that connects two monosaccharides is formed through a specific reaction. This reaction involves the hydroxyl group (-OH) of one monosaccharide and the hemiacetal or hemiketal group of another monosaccharide.

4. **Identify the Correct Bond**: The bond formed between these two groups is known as a glycosidic bond. This is a type of covalent bond, which is one of the strongest types of chemical bonds.

5. **Eliminate Incorrect Options**:
- **Amide Bond**: This bond is found in proteins, where amino acids are linked together.
- **Phosphodiester Bond**: This bond is found in nucleic acids, linking nucleotides together.
- **Hydrogen Bond**: This bond occurs between hydrogen and electronegative atoms, commonly seen in DNA structures.

6. **Conclusion**: The correct answer to the question is the glycosidic bond, as it specifically refers to the bond that connects two carbohydrate residues.

### Final Answer:
The bond present between two residues of carbohydrates is called a **glycosidic bond**.

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