Question

Match List - I with List - II.

List - I	List - II
A. Citric Acid Cycle	I. Phosphofructokinase
B. Glycolysis	II. Citrate synthase
C. Pyruvate Oxidation	III. Glycogen synthase
D. Glycogenolysis	IV. Pyruvate dehydrogenase

Choose the correct answer from the options given below:

• A. A-II, B-I, C-IV, D-III \
• B. A-I, B-II, C-III, D-IV \
• C. A-IV, B-III, C-II, D-I \
• D. A-III, B-I, C-II, D-IV

Hint:

Pyruvate Dehydrogenase links glycolysis to the Krebs cycle, while Citrate Synthase catalyzes the very first step of the Citric Acid Cycle.

Answer 1

The Correct Option is A

Step 1: Concept Metabolic pathways are controlled by specific key enzymes that catalyze rate-limiting or highly regulated steps within the cell.

Step 2: Meaning Matching these metabolic pathways to their corresponding enzymes.

Step 3: Analysis * Citric Acid Cycle (A) begins when acetyl-CoA condenses with oxaloacetate, a step catalyzed by Citrate synthase $\rightarrow$ (A-II). * Glycolysis (B) is primarily regulated by its key rate-limiting enzyme, Phosphofructokinase $\rightarrow$ (B-I). * Pyruvate Oxidation (C) connects glycolysis to the citric acid cycle by converting pyruvate to acetyl-CoA via the Pyruvate dehydrogenase complex $\rightarrow$ (C-IV). * Glycogenolysis/Glycogenesis (D) pathways manage glycogen storage balance, where Glycogen synthase regulates glycogen production $\rightarrow$ (D-III).

Step 4: Conclusion The resulting matching sequence is A-II, B-I, C-IV, D-III, corresponding to option A. Final Answer: (A)