In what way do glucose and fructose differ?

Explanation

### Step-by-Step Solution:

1. **Definition and Structure**:
- **Glucose**: It is a simple sugar (monosaccharide) that serves as a primary energy source for living organisms. Its chemical formula is C6H12O6, and it is classified as an aldohexose due to the presence of an aldehyde group.
- **Fructose**: This is also a simple sugar (monosaccharide) but is classified as a ketohexose because it contains a ketone group. Its chemical formula is also C6H12O6, but its structure differs from glucose.

2. **Sources**:
- **Glucose**: It is commonly found in fruits, honey, and is a product of starch hydrolysis. It is also a building block for polysaccharides like starch, glycogen, and cellulose.
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