Question

Antimycin is used as a piscicide (fish poison) because it inhibits Complex III of the ETC. Blocking the flow of electrons through Complex III will produce which of the following effects? I. Complex I (NADH dehydrogenase) will persist in a reduced state II. Complex IV (Cytochrome C oxidase) will persist in a reduced state III. Oxygen consumption will be decreased

A. I, II, and III
B. II and III
C. I and III only
D. III only

Answer 1

Option A. Blocking the flow of electrons through Complex III of the ETC will lead to Complex I and Complex IV persisting in a reduced state and a decrease in oxygen consumption.

Step-by-step explanation:

Blocking the flow of electrons through Complex III of the Electron Transport Chain (ETC) will have the following effects:

1. Complex I (NADH dehydrogenase) will persist in a reduced state.
2. Complex IV (Cytochrome C oxidase) will persist in a reduced state.
3. Oxygen consumption will be decreased.

Therefore, the correct answer is A. I, II, and III.