Glucose and galactose unite to form

Options

A. Maltose
B. Sucrose
C. Isomaltose
D. Lactose

Answer

To solve the question "Glucose and galactose unite to form," we need to identify the disaccharide that is composed of these two monosaccharides.

### Step-by-Step Solution:

1. **Identify the Monosaccharides**:
- The question states that we have glucose and galactose. Both of these are monosaccharides, which are the simplest form of carbohydrates.

2. **Understand Disaccharides**:
- Disaccharides are formed when two monosaccharides combine through a glycosidic bond.

3. **Recall the Possible Combinations**:
- The options given are maltose, sucrose, isomaltose, and lactose. We need to determine which of these is formed by the combination of glucose and galactose.

4. **Analyze Each Option**:
- **Maltose**: Composed of two glucose molecules.
- **Sucrose**: Composed of glucose and fructose.
- **Isomaltose**: Composed of two glucose molecules, but with a different linkage.
- **Lactose**: Composed of one glucose and one galactose molecule.

5. **Select the Correct Answer**:
- Since lactose is the only disaccharide formed from glucose and galactose, the correct answer is **lactose**.

### Final Answer:
Glucose and galactose unite to form **lactose**.

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