Two Acetyl-coA molecules released from a fatty acid enter the Krebs cycle, and can produce six NADH molecules and two FADH2 molecules. These reduced coenzymes can be used to generate: a) 28 ATP b) 22 ATP c) 12 ATP d) 6 ATP e) 4 net ATP
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and can produce six NADH molecules and two FADH2 molecules. These reduced coenzymes can be used to generate:
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- Consider the steps of the krebs cycle and electron carrier chain and answer: a) How many ATPs are produced from 10 Pyruvato molecules? b) How many ATPs are produced from 12 Acetyl CoA molecules?Which of the following pair of substances are products of the citric acid cycle? a) Acetyl CoA and NADH b) Acetyl CoA and CO2 c) CoA-SH and FADH2 d) Citrate and CO2a) In the presence of oxygen, the products of glycolysis undergo another reaction. In this reaction, the products of glycolysis react with coenzyme A to produce the following. + COA ---> + NAD+
- Which of the following statements regarding the glycolysis pathway is FALSE? A) O Two pyruvate molecules are generated. B) O ATP molecules are generated via substrate-level phosphorylation C) O It does not require oxygen to operate D) O ATPS are used (hydrolyzed) in the beginning of glycolysis. E) O None of the above are false; they are all true statementsWhat metabolic products are formed from pyruvate in each case: a) anaerobic conditions in the body b) anaerobic conditions in yeast c) aerobic conditionsIn one of the steps of glycolysis, the enzyme pyruvate kinase catalyzes the conversion of phosphoenolpyruvate to pyruvate; the phosphate group from phosphoenolpyruvate is transferred to ADP to form ATP during the reaction. This process is an example of: A) O ATP synthesis by substrate-level phosphorylation B) O coupling an energy releasing process to an energy requiring process C) O oxidative phosphorylation D) OB and C are correct E) OA and B are correct
- During the metabolism of glucose in anaerobic cells, the enzyme lactate dehydrogenase is essential to allow glycolysis to continue. This enzyme catalyzes the reduction of pyruvate to lactate. Why is this so essential? OA) It lowers the pH. B) It re-oxidizes NADH to NAD+. C) Lactate stimulates hexokinase activity. D) Pyruvate inhibits pyruvate kinase.Which of the following is true of the steps of glycolysis which yield pyruvate as the end product? a) They all occur in the cytoplasm. b) They all occur in the mitochondria. c) They occur primarily in the mitochondria. d) They occur primarily in the cytoplasm.Which of the following statements is true?a) the ATP synthase adds electrons directly to ADP to make ATP b) acetyl CoA produced in the citric acid cycle carries electrons to the electrontransport chainc) the electron transport chain pumps protons from the cytosol into the inter-membrane space of mitochondriad) carbon monoxide is an electron transport chain blocker
- a) Using full chemical structures of substrates and products, draw the two possible pyruvate reduction pathways that regenerate NAD+ from NADH in the absence of oxygen gas. Give names of all compounds and enzymes involved. b) Draw the step in glycolysis that requires at least one of the above pathways to be functional in the absence of oxygen. Give names of all compounds and enzymes involved.a) What is the reason for the non-oxidative phase of the pentose phosphate pathway?b) Which compound is converted into which compound in the step where sequential dehydration and hydration reactions occur in the citric acid cycle?c) Why is ammonia released in some tissues carried by binding to other molecules in the blood? Where is it transmitted in the body for its destruction? What molecule is it transferred onto there? So what molecule does it make?|a) Explain why the citric acid cycle is considered to be the center of cellular metabolism. b) What are the substrates and products corresponding to one turn of the citric acid cycle? (no need for enzymes) c) Which steps of the citric acid cycle release CO2 as a product? Which steps produce NADH or FADH2? Which step produces GTP? d) How much ATP can be generated from glucose when the citric acid cycle is operating?