lactose,carbohydrate is made up of

Options

A. `beta`-glucose & glucose
B. glucose & mannose
C. `beta` -glucose & `beta` -glactose
D. glucose & fructose

Answer

To determine what lactose, a carbohydrate, is made up of, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Type of Carbohydrate**:
- Lactose is classified as a disaccharide. Disaccharides are carbohydrates that consist of two monosaccharide units.

2. **Determine the Monosaccharide Units**:
- The two monosaccharides that make up lactose are beta-glucose and beta-galactose.

3. **Understand the Linkage**:
- These two monosaccharides are joined together by a specific type of bond known as a glycosidic linkage. In the case of lactose, it is a beta 1,4 glycosidic linkage.

4. **Recognize the Importance of Lactose**:
- Lactose is commonly known as milk sugar and is an important carbohydrate found in milk.

5. **Evaluate the Options**:
- Given the options:
- A) Beta glucose and glucose (Incorrect, this forms maltose)
- B) Glucose and mannose (Incorrect)
- C) Beta glucose and beta galactose (Correct)
- D) Glucose and fructose (Incorrect, this forms sucrose)
- The correct answer is option C: Beta glucose and beta galactose.

### Final Answer:
Lactose, a carbohydrate, is made up of beta-glucose and beta-galactose.

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