Question

Match List-I with List-II

List-I (Process Enzyme) & List-II (Location in the cell)
(A). Triacylglycerol synthesis & (I). Mitochondria
(B). Glycolate oxidase & (II). Plastids
(C). Hexose Monophosphate Shunt & (III). Endoplasmic reticulum
(D). Serine synthesis in photorespiration & (IV). Peroxisome

Choose the correct answer from the options given below:

• (A) - (IV), (B) - (III), (C) - (I), (D) - (II)
• (A) - (II), (B) - (III), (C) - (IV), (D) - (I)
• (A) - (III), (B) - (IV), (C) - (II), (D) - (I)
• (A) - (III), (B) - (IV), (C) - (I), (D) - (II)

Hint:

To remember the flow of photorespiration (C2 cycle):
Glycolate moves from Chloroplast to Peroxisome (oxidized by glycolate oxidase), then Glycine moves to Mitochondria (converted to Serine).

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Eukaryotic cells partition metabolic pathways into specific organelles. This compartmentalization prevents conflicting metabolic processes from occurring simultaneously.

Step 2: Detailed Explanation:
Let's pair each metabolic process in List-I with its subcellular compartment in List-II:
- (A) Triacylglycerol (TAG) Synthesis: Triacylglycerols are synthesized in the membranes of the endoplasmic reticulum (III) via the Kennedy pathway.
The synthesized lipids are then budded off into the cytosol as lipid bodies (spherosomes).
- (B) Glycolate Oxidase: A key enzyme in photorespiration.
It catalyzes the oxidation of glycolate to glyoxylate in the peroxisome (IV), producing hydrogen peroxide as a byproduct.
- (C) Hexose Monophosphate (HMP) Shunt Pentose Phosphate Pathway: Occurs in both the cytosol and plastids (II) of plant cells.
The plastidial pathway is essential for generating NADPH used in biosynthetic processes like lipid and carotenoid synthesis.
- (D) Serine Synthesis in Photorespiration: During photorespiration, two molecules of glycine are converted into one molecule of serine.
This reaction is catalyzed by the glycine decarboxylase complex in the mitochondrial matrix (I).
This matching sequence corresponds to Option 3.

Step 3: Final Answer:
The correct match is (A) - (III), (B) - (IV), (C) - (II), (D) - (I).