Maltose is formed by the following monosaccharides
(a) glucose + glucose
(b) glucose + galactose
(c) glucose + fructose
(d) fructose + galactose

Options

A. glucose + glucose
B. glucose + galactose
C. glucose + fructose
D. fructose + galactose

Answer

To determine which monosaccharides combine to form maltose, let's analyze the options provided:

1. **Understanding Maltose**:
- Maltose is a disaccharide, which means it is formed by the combination of two monosaccharide units.
- The two monosaccharides are linked together by a glycosidic bond, which is formed through a dehydration reaction (loss of a water molecule).

2. **Analyzing Each Option**:
- **(a) Glucose + Glucose**:
- When two glucose molecules undergo a dehydration reaction, they form maltose. This is the correct combination for maltose.
- **(b) Glucose + Galactose**:
- This combination forms lactose, not maltose.
- **(c) Glucose + Fructose**:
- This combination forms sucrose, not maltose.
- **(d) Fructose + Galactose**:
- This combination does not form maltose; it does not correspond to any common disaccharide.

3. **Conclusion**:
- The only correct option that forms maltose is **(a) Glucose + Glucose**.

Final Answer: **(a) glucose + glucose**

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