Question

Choose the correct enzyme - substrate pair.

• A. carbohydrate - lipase
• B. maltase - lactose
• C. rennin - caesin
• D. protein - amylase.

Answer 1

The Correct Option is C

To determine the correct enzyme-substrate pair, we must first understand the roles of the given enzymes and substrates:

1. Carbohydrate - Lipase: Lipase is an enzyme responsible for breaking down lipids (fats), not carbohydrates. Thus, this is an incorrect pair.
2. Maltase - Lactose: Maltase is an enzyme that acts on maltose, a type of sugar, not lactose. Therefore, this pair is incorrect. Lactase would be the correct enzyme for lactose.
3. Rennin - Casein: Rennin, also known as chymosin, is an enzyme that specifically acts on casein, a protein found in milk. This pairing is correct, as rennin helps in coagulating milk, particularly in the stomachs of young mammals.
4. Protein - Amylase: Amylase is an enzyme that breaks down starches into simple sugars. It does not act on proteins. Therefore, this is an incorrect pair.

Based on the above analysis, the correct enzyme-substrate pair from the options given is Rennin - Casein.

Conclusion: Rennin is the enzyme that acts on the substrate casein, justifying why this pairing is correct.