Enzymes

Let's match the enzymes with their reactions. Invertase catalyzes the hydrolysis of sucrose into glucose and fructose, so A matches II. Pepsin breaks down proteins into peptides, so B matches III. Diastase (a type of amylase) converts starch into maltose, so C matches IV. Thus, the correct matching is: This corresponds to option 3. Thus, the correct answer is A-II, B-III, C-IV.

Competitive inhibitors (X) bind to the active site of the enzyme, competing with the substrate for binding. Non-competitive inhibitors (Y), however, bind to a site other than the active site, known as the allosteric site, and affect enzyme activity by altering its structure. Hence, the correct statement is that X binds to the active site and Y binds to the allosteric site.

In the matching, we observe that:
- Zymase is used in the conversion of sucrose to glucose and fructose.
- Pepsin is used in the conversion of proteins to peptides.
- Invertase is involved in the breakdown of starch to maltose.
- Diastase is used in the conversion of glucose to ethanol and carbon dioxide.
Thus, the correct matching is A-III, B-II, C-IV, D-I.