Question

Match Group-I (enzyme), Group-II (reaction catalyzed by the enzyme), and Group-III (subcellular localization of the enzyme and the associated metabolic process) in the CORRECT combination.

• A. P-III-a, Q-IV-d, R-I-b, S-II-c
• B. P-II-a, Q-III-d, R-I-b, S-IV-c
• C. P-I-a, Q-II-b, R-I-d, S-III-c
• D. P-IV-a, Q-II-d, R-I-b, S-III-c

Hint:

In metabolic pathways, enzymes are often localized in specific organelles like chloroplasts, mitochondria, and peroxisomes to carry out their respective reactions.

Answer 1

The Correct Option is A

Step 1: Understanding the enzymes and reactions.
- PEP Carboxylase (P) is involved in the C4 cycle in the cytosol, catalyzing the conversion of phosphoenolpyruvate to oxaloacetate. - Rubisco (Q) is an enzyme in the C3 cycle in the chloroplast, catalyzing the fixation of CO2 to ribulose 1,5-bisphosphate. - Glycolate oxidase (R) is involved in the C2 cycle in the peroxisome, catalyzing the conversion of glycolate into glyoxylate and hydrogen peroxide. - Pyruvate dehydrogenase (S) is involved in aerobic respiration in the mitochondria, catalyzing the conversion of pyruvate into acetyl-CoA, CO2, and NADH.
Step 2: Analyzing the options.
- (A) P-III-a: PEP carboxylase catalyzes the reaction in the cytosol for the C4 cycle. - (B) Q-IV-d: Rubisco catalyzes the reaction in the chloroplast for the C3 cycle. - (C) R-I-b: Glycolate oxidase catalyzes the reaction in the peroxisome for the C2 cycle. - (D) S-II-c: Pyruvate dehydrogenase catalyzes the reaction in the mitochondria for aerobic respiration.
Step 3: Conclusion.
The correct answer is (A) because all enzyme reactions and their localizations match correctly with the respective metabolic cycles.