Lactose is composed of

Options

A. Glucose + Galactose
B. Glucose+ Fructose
C. Glucose + Glucose
D. Glucose+ Mannose

Answer

**Step-by-Step Solution:**

1. **Identify Lactose**: Begin by recognizing that lactose is a type of sugar known as a disaccharide. Disaccharides are carbohydrates composed of two monosaccharide units.

2. **Determine the Components**: Lactose is specifically formed from two monosaccharides: glucose and galactose.

3. **Understand the Breakdown**: When lactose is broken down (for example, during digestion), it separates into its constituent monosaccharides, which are glucose and galactose.

4. **Review the Options**: If options are provided, identify which one correctly states that lactose is made up of glucose and galactose.

5. **Eliminate Incorrect Options**:
- Glucose + Fructose forms sucrose (not lactose).
- Glucose + Glucose forms maltose (not lactose).
- Glucose + Mannose does not form lactose; mannose is an epimer of glucose.

6. **Conclude**: Based on the information, the correct answer is that lactose is composed of glucose and galactose.

**Final Answer**: Lactose is composed of glucose and galactose.

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