1. Which one of the following shows the correct sequence of energy transitions during chemiosmosis? A. NADH → electron acceptors → proton gradient → ATP synthase → ATP B. NADH → NAD+ → FADH2 → electron acceptors → ATP C. carbohydrates → acetyl CoA → CO2 → proton gradient → ATP D. NAD+ → NADH → protons → ADP → ATP E. glucose → pyruvate → acetyl CoA → NADH → ATP 2. Facultative anaerobes: A. prefer carbon dioxide. B. must have oxygen. C. must have carbon dioxide. D. prefer oxygen. E. are killed by oxygen. 3. When Fe3+ is used instead of O2 as the terminal electron acceptor in mitochondria: A. all the other answers are correct. B. less energy is gained for ATP production. C. less energy is transferred to the proton gradient. D. less ATP is produced. E. less energy is gained for chemiosmosis.
solution:- The correct answers are as follows:- QNO1;- The correct answer for this question is option (A). The NADH acts as an electron donor, these electrons are carried by the electron carriers which is coupled with the generation of the proton gradient. Protons move back into the matrix with the help of the ATP synthase complex. QNO2;- The correct answer for this question is option (D). Although facultative anaerobes can grow with and without oxygen, they still prefer to grow in oxygen rich conditions because aerobic respiration produces more oxygen. QNO3:- the correct option for this question is option (A) which is all the other answers are correct.
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