Discussion
Match the inhibitors in Group 1 with their respective targets in Group 2.
| Group 1 | Group 2 |
|---|---|
| (P) Oligomycin | (i) Cytochrome bc1 complex |
| (Q) Antimycin A | (ii) Photosystem II |
| (R) 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU) | (iii) K+ ionophore |
| (S) Valinomycin | (iv) FO ATP synthase |
Answer: B
The correct match is P-iv, Q-i, R-ii, S-iii.
- Oligomycin blocks the proton channel of the FO part of ATP synthase.
- Antimycin A blocks the cytochrome bc1 complex (complex III) at the Qi site.
- DCMU (diuron) binds the QB site of photosystem II and stops electron flow from it.
- Valinomycin is a K+ ionophore that carries potassium across membranes and dissipates the membrane potential.
The other options interchange these targets, for example giving oligomycin to complex III.
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