AP BIOLOGY

Detailed explanation-1: -The electron transport cycle requires oxygen, which serves as the last electron transporter and produces water. Despite the fact that oxygen isn’t directly involved in the TCA cycle, if it isn’t available, the TCA cycle will come to a halt due to a lack of NAD+ and FAD .

Detailed explanation-2: -Note that the only part of aerobic respiration that physically uses oxygen is the electron transport chain. However, the citric acid cycle can not occur in the absence of oxygen because there is no way to regenerate the NAD+ used during this process.

Detailed explanation-3: -6. Which statement is NOT true of the citric acid cycle? All enzymes of the cycle are located in the cytoplasm, except succinate dehydrogenase, which is bound to the inner mitochondrial membrane.

Detailed explanation-4: -Answer and Explanation: The correct answer is (d) All of the above. The citric acid cycle is a strictly aerobic pathway in that it does not produce much energy directly, but supplies products for oxidative phosphorylation, which uses oxygen (aerobic respiration) to produce energy.

Detailed explanation-5: -Summary. In the presence of oxygen, pyruvate is transformed into an acetyl group attached to a carrier molecule of coenzyme A. The resulting acetyl CoA can enter several pathways, but most often, the acetyl group is delivered to the citric acid cycle for further catabolism.