Which of the following combinations are correct?
| Enzyme | Final product formed | |
| A. | Maltase | Glucose |
| B. | Pepsin | Ammonia and \(CO_2\) |
| C. | Urease | Amino acid |
| D. | Zymase | Ethanol and \(CO_2\) |
| E. | Diastase | Glucose |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → A and D only
Each enzyme catalyses one particular reaction (enzymes are highly specific), so each enzyme gives its own product.
(A) Maltase – Glucose — Correct. Maltase hydrolyses the disaccharide maltose into two molecules of glucose.
\( \underset{\text{maltose}}{\ce{C12H22O11}} + \ce{H2O} \xrightarrow{\text{Maltase}} \underset{\text{glucose}}{\ce{2C6H12O6}} \)
(B) Pepsin – Ammonia and \( \ce{CO2} \) — Incorrect. Pepsin hydrolyses proteins into peptides and amino acids. Ammonia and \( \ce{CO2} \) come from urea with urease.
(C) Urease – Amino acid — Incorrect. Urease decomposes urea into ammonia and carbon dioxide; no amino acid is formed.
\( \ce{NH2CONH2 + H2O} \xrightarrow{\text{Urease}} \ce{2NH3 + CO2} \)
(D) Zymase – Ethanol and \( \ce{CO2} \) — Correct. Zymase, from yeast, ferments glucose into ethyl alcohol and carbon dioxide.
\( \ce{C6H12O6} \xrightarrow{\text{Zymase}} \ce{2C2H5OH + 2CO2} \)
(E) Diastase – Glucose — Incorrect. Diastase converts starch into maltose, not glucose.
\( \underset{\text{starch}}{\ce{2(C6H10O5)_{n}}} + \ce{nH2O} \xrightarrow{\text{Diastase}} \underset{\text{maltose}}{\ce{nC12H22O11}} \)
NCERT (Pre-rationalised edition, 2022-23):
Enzyme Catalysis – …
