CELL RESPIRATION
THE KREBS CYCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Reduction of ATP and GTP
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Reduction of NAD+ and FAD
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Oxidation of NAD+ and FAD
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Oxidation of ATP and GTP
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Detailed explanation-1: -Electrons from NADH and FADH2 are passed to protein complexes in the electron transport chain. As they are passed from one complex to another (there are a total of four), the electrons lose energy, and some of that energy is used to pump hydrogen ions from the mitochondrial matrix into the intermembrane space.
Detailed explanation-2: -Oxidative phosphorylation, the process where electron transport from the energy precursors from the citric acid cycle (step 3) leads to the phosphorylation of ADP, producing ATP. This also occurs in the mitochondria.
Detailed explanation-3: -First, acetyl CoA combines with oxaloacetate, a four-carbon molecule, losing the CoA group and forming the six-carbon molecule citrate. After citrate undergoes a rearrangement step, it undergoes an oxidation reaction, transferring electrons to NAD+ to form NADH and releasing a molecule of carbon dioxide.
Detailed explanation-4: -The answer is NADH and FADH2. The citric acid cycle requires Acetyl CoA as a starting material for the process. The Acetyl CoA is used to produce ATP molecules and some reduced electron carriers. The reduced electron carriers produced are NADH and FADH2.