How many molecules of water are liberated by the union of two monosaccharide units to form a disaccharide?

Explanation

To determine how many molecules of water are liberated when two monosaccharide units unite to form a disaccharide, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Monosaccharides**:
- Monosaccharides are the simplest form of carbohydrates and consist of single sugar units like glucose and fructose.

2. **Formation of Disaccharides**:
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