more question for bioenergetics and oxidative phosphorylation

1. Which one of the following statements is most correct?
A Oxidation of pyruvate to carbon dioxide and water does not involve the TCA cycle.
B The major pathway for electron transfer to oxygen in the electron transport system does not involve pyridine nucleotides.
C An adequate supply of ADP is required for maximal respiration by mitochondria.
D Coenzyme Q is a prosthetic group of a flavoprotein.
E Substrate level phosphorylation cannot occur in the absence of oxygen

2.	Which one of the following enzyme systems may be used as a marker enzyme for mitochondrial electron transport system?
A	Glucose 6-phosphate dehydrogenase
B	Succinate dehydrogenase (succinate-cytochrome c reductase)
C	Phosphoenolpyruvate carboxykinase
D	Lactate dehydrogenase
E	Acetyl-CoA carboxylase 3. Rotenone inhibits malate oxidation but not succinate oxidation because A it is a competitive inhibitor of malate dehydrogenase. B it does not react with flavoprotein enzymes. C it inhibits at the NADH dehydrogenase while succinate dehydrogenase interacts with the respiratory chain at ubiquinone, bypassing this site of inhibition. D it inhibits at cytochrome b while succinate dehydrogenase interacts with the respiratory chain at cytochrome c. E it inhibits at the cytochrome oxidase but succinate is oxidized by a flavin oxidase. 4. Cyanide is a deadly poison because it A binds to myoglobin. B interferes with respiratory control. C forms addition compounds with important aldehydes such as pyridoxal. D reacts with cytochrome oxidase. E inhibits the cytochrome P-450 monooxygenases. 5. The main function of the mitochondrial electron transport chain is to A generate a P/O ratio of 2.5. B recycle NAD for glycolysis. C provide reducing equivalents. D lower the oxidation state of the cell. E generate energy for ATP formation. 7. Which of the following tissues has the lowest respiratory rate? A adipose tissue B brain C liver D red blood cell E skeletal muscle sources: https://med-eval.med.uiuc.edu/cgi-bin/exam/practicefeedback.p