Step 1: Understanding enzymatic conversion.
- In high fructose corn syrup (HFCS) production, glucose isomerase is the enzyme that converts glucose to fructose.
- This enzymatic reaction is the key step in producing HFCS, which has higher sweetness than regular corn syrup.
Step 2: Explanation of incorrect options.
- Invertase (B): This enzyme breaks down sucrose into glucose and fructose, not glucose to fructose.
- Amylase (C): Breaks down starch into glucose, not involved in the conversion to fructose.
- Epimerase (D): This enzyme changes the configuration of molecules, but it does not specifically convert glucose to fructose.
Step 3: Selecting the correct option.
Since glucose isomerase is responsible for glucose-to-fructose conversion, the correct answer is (A) Isomerase.