Correctly match the letter in the diagram of this Electron Transport chain with the functional description.
1: e to f
2: g
3: h to i
4: k to l

Question

Correctly match the letter in the diagram of this Electron Transport chain with the functional description. 
1: e to f
2: g
3: h to i
4: k to l

BlackTom AI · Accepted Answer

The question asks you to correctly match the letters in the diagram of the Electron Transport Chain with the functional descriptions provided.
Option 0: "[ 选择 ]" appears to be a placeholder and not a functional description, so it cannot be evaluated as a descriptive statement about the ETC.
Option 1: "ADP bonds to P and forms ATP with the help of the ATP synthase protein" This describes the chemiosmotic coupling step where ATP synthase converts ADP and inorganic phosphate (P) into ATP as protons flow back across the membrane. This is a core function of the ETC/oxidative phosphorylation and is generally true within mitochondria.
Option 2: "O2 receives electrons and H2O is formed" This is the terminal step of the ETC, where molecular oxygen accepts electrons and, with protons, is reduced to water. This statement correctly describes the final electron acceptor and product of the chain, provided oxygen is present.
Option 3: "NADH is oxidized to NAD+ and e- passed to Redox protein" In the ETC, NADH donates electrons and is oxidized to NAD+; electrons are passed through a series of redox carriers (including flavoproteins and iron-sulfur proteins) toward the final electron acceptor. This describes the initial electron donation event and subsequent electron transfer, which is accurate.
Option 4: "H+ released forming a Hydrogen gradient" Protons are pumped across the membrane by several protein complexes, creating a proton (H+) gradient used by ATP synthase to make ATP. This statement captures the chemiosmotic mechanism and gradient formation that drives ATP synthesis.
Where this becomes tricky is that the prompt asks to match specific diagram letters (1: e to f, 2: g, 3: h to i, 4: k to l) to these descriptions. Without the actual key that maps each letter pair to a functional description, we cannot definitively assign which letter pair corresponds to which description. The correct approach is to use the diagram’s legend or the instructor’s key to connect each letter (e, f, g, h, i, k, l, etc.) to the exact described process (e.g., which step involves NADH oxidation, which involves proton pumping, etc.). If you have access to that key, apply it by locating where NADH oxidation occurs (likely at the entry point of the chain) and where proton pumping occurs (sites of increased H+ gradient), as well as the terminal oxygen reduction step, and then map those letters to options 3, 4, and 2 respectively. In summary: all options 1–4 reflect correct aspects of ETC physiology, but the specific letter assignments require the diagram’s matching key that isn’t provided here.
If you can share the matching key or which letter corresponds to which part of the diagram, I can complete the precise one-to-one matches for 1:e to f, 2:g, 3:h to i, and 4:k to l.

SMC 2025 Spr - BIOL 3 (1286,1288) - Fundamentals of Biology (G) Quiz 6 (Cell Resp)

Correctly match the letter in the diagram of this Electron Transport chain with the functional description. 1: e to f 2: g 3: h to i 4: k to l

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