Enzymes that catalyse the transfer of molecules except H, O and electron are called as

Options

A. Ligases
B. Isomerases
C. Lyases
D. Transferases

Answer

To solve the question, "Enzymes that catalyse the transfer of molecules except H, O and electron are called as," we will analyze the options provided and determine which type of enzyme fits the description.

### Step-by-Step Solution:

1. **Understanding the Question**:
- We need to identify the type of enzyme that facilitates the transfer of molecules but specifically excludes the transfer of hydrogen (H), oxygen (O), and electrons.

2. **Analyzing the Options**:
- **Option A: Ligases**
- Ligases are enzymes that catalyze the joining of two molecules by forming new chemical bonds. They do not transfer functional groups or molecules; instead, they create bonds.
- **Conclusion**: Ligases do not fit the description.

- **Option B: Isomerases**
- Isomerases convert one molecule into another by altering its isomers. This means they rearrange the structure of a molecule without transferring any functional groups.
- **Conclusion**: Isomerases do not fit the description.

- **Option C: Lyases**
- Lyases catalyze the breaking of chemical bonds and can form new bonds or structures in the process. They typically do not transfer functional groups but rather break down molecules.
- **Conclusion**: Lyases do not fit the description.

- **Option D: Transferases**
- Transferases are enzymes that transfer specific functional groups from one molecule to another. They do not transfer hydrogen, oxygen, or electrons but can transfer groups like amino, methyl, or carboxyl groups.
- **Conclusion**: Transferases fit the description as they transfer specific functional groups while excluding H, O, and electrons.

3. **Final Answer**:
- Based on the analysis, the correct answer is **Transferases**.