Correct option is B
Explanation: This question asks to match the inhibitors of the electron transport chain with their target enzymes. Here’s the breakdown:
A) Dicyclohexylcarbodiimide and Oligomycin inhibit ATP Synthase (complex V), which is responsible for synthesizing ATP during oxidative phosphorylation. Therefore, the correct match is (ii).
B) Rotenone and Demerol inhibit NADH coenzyme Q reductase (complex I), which is responsible for transferring electrons from NADH to coenzyme Q. Therefore, the correct match is (i).
C) Thenoyltrifluoroacetone and Carboxin inhibit Succinate coenzyme Q reductase (complex II), which is involved in transferring electrons from succinate to coenzyme Q. Therefore, the correct match is (iii).
D) Cyanide and Azide inhibit Cytochrome c oxidase (complex IV), which is responsible for transferring electrons to oxygen. Therefore, the correct match is (iv).
Information Booster:
ATP Synthase (complex V) is essential for ATP production, and its inhibition leads to a halt in cellular energy production.
NADH coenzyme Q reductase (complex I) plays a crucial role in the electron transport chain by transferring electrons from NADH to coenzyme Q.
Succinate coenzyme Q reductase (complex II) is involved in the transfer of electrons from succinate to coenzyme Q and is a point of inhibition for substances like Carboxin and Thenoyltrifluoroacetone.
Cytochrome c oxidase (complex IV) is the terminal enzyme complex in the electron transport chain, responsible for transferring electrons to oxygen and completing the electron transfer process.
