Sucrose is a disaccharide formed of two subunit sugars which are

Options

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

Answer

To solve the question about the subunit sugars that form sucrose, we can follow these steps:

### Step 1: Understand what a disaccharide is
A disaccharide is a type of carbohydrate that consists of two monosaccharide (simple sugar) units linked together by a glycosidic bond.

**Hint:** Remember that disaccharides are made from two monosaccharides.

### Step 2: Identify the components of sucrose
Sucrose is specifically known to be composed of two different monosaccharides. We need to identify these two sugars.

**Hint:** Think about common sugars and their combinations.

### Step 3: Recall the monosaccharides that form sucrose
The two monosaccharides that combine to form sucrose are glucose and fructose. Glucose is a six-carbon sugar, while fructose is a five-carbon sugar.

**Hint:** Consider the common sources of sucrose, like sugar cane and sugar beets, which contain these two sugars.

### Step 4: Eliminate other options
- **Galactose and Glucose**: This combination forms lactose, not sucrose.
- **Glucose and Glucose**: This combination forms maltose, not sucrose.
- **Galactose and Fructose**: This combination forms lactulose, not sucrose.

**Hint:** Use your knowledge of other disaccharides to eliminate incorrect options.

### Step 5: Conclude with the correct answer
Since we have identified that sucrose is made from glucose and fructose, the correct answer is:

**Answer:** Sucrose is formed from the subunit sugars glucose and fructose.

**Final Answer:** Option A: Glucose and Fructose.