Lyases and ligases

Explanation

### Step-by-Step Solution

1. **Definition of Lyases**:
- Lyases are enzymes that catalyze the breaking of chemical bonds in the absence of water. They facilitate reactions that result in the formation of double bonds or new rings by the removal of groups from substrates.

2. **Function of Lyases**:
- Lyases are involved in elimination reactions, where they remove groups from substrates, leading to the formation of double bonds. They can also participate in hydrolysis reactions, where they help in breaking down larger molecules into smaller ones.

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