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Which of the following statements are correct?
(A) The oxidation of pyruvic acid molecules formed in glycolysis occurs inside the mitochondria.
(B) Acetyl CoA is a 3-carbon compound.
(C) Under anaerobic conditions, the pyruvic acid formed during glycolysis is reduced to either ethyl alcohol or lactic acid.
(D) Acetyl CoA molecules enter into cyclic reactions during Calvin cycle.
- a)(A) and (B)
- b)(C) and (D)
- c)(A) and (C)
- d)(B) and (C)
Correct answer is option 'C'. Can you explain this answer?
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Which of the following statements are correct?(A) The oxidation of pyr...
Statement (A): The oxidation of pyruvic acid molecules formed in glycolysis occurs inside the mitochondria.
This statement is correct. After glycolysis, pyruvic acid molecules are transported into the mitochondria, where they undergo further oxidation in a process called the Krebs cycle or citric acid cycle. This cycle takes place in the mitochondrial matrix, producing energy-rich molecules such as ATP and NADH.
Statement (B): Acetyl CoA is a 3-carbon compound.
This statement is incorrect. Acetyl CoA is a 2-carbon compound. It is formed when a molecule of pyruvic acid undergoes decarboxylation, resulting in the release of carbon dioxide. Acetyl CoA is an important molecule in cellular respiration as it enters the Krebs cycle and acts as a key intermediate in the oxidation of glucose.
Statement (C): Under anaerobic conditions, the pyruvic acid formed during glycolysis is reduced to either ethyl alcohol or lactic acid.
This statement is correct. Under anaerobic conditions, when oxygen is not available, pyruvic acid is converted into either ethyl alcohol or lactic acid through a process called fermentation. In yeast and some microorganisms, pyruvic acid is converted to ethyl alcohol, while in certain bacteria and muscle cells, it is converted to lactic acid. Fermentation allows for the regeneration of NAD+ molecules, which are required for glycolysis to continue in the absence of oxygen.
Statement (D): Acetyl CoA molecules enter into cyclic reactions during the Calvin cycle.
This statement is incorrect. Acetyl CoA does not enter into cyclic reactions during the Calvin cycle. The Calvin cycle, which is a part of photosynthesis, takes place in the chloroplasts of plants. It involves the fixation of carbon dioxide and the synthesis of glucose. Acetyl CoA, on the other hand, is primarily involved in cellular respiration and acts as a key intermediate in the oxidation of glucose.
Overall, the correct statements are (A) and (C).
This statement is correct. After glycolysis, pyruvic acid molecules are transported into the mitochondria, where they undergo further oxidation in a process called the Krebs cycle or citric acid cycle. This cycle takes place in the mitochondrial matrix, producing energy-rich molecules such as ATP and NADH.
Statement (B): Acetyl CoA is a 3-carbon compound.
This statement is incorrect. Acetyl CoA is a 2-carbon compound. It is formed when a molecule of pyruvic acid undergoes decarboxylation, resulting in the release of carbon dioxide. Acetyl CoA is an important molecule in cellular respiration as it enters the Krebs cycle and acts as a key intermediate in the oxidation of glucose.
Statement (C): Under anaerobic conditions, the pyruvic acid formed during glycolysis is reduced to either ethyl alcohol or lactic acid.
This statement is correct. Under anaerobic conditions, when oxygen is not available, pyruvic acid is converted into either ethyl alcohol or lactic acid through a process called fermentation. In yeast and some microorganisms, pyruvic acid is converted to ethyl alcohol, while in certain bacteria and muscle cells, it is converted to lactic acid. Fermentation allows for the regeneration of NAD+ molecules, which are required for glycolysis to continue in the absence of oxygen.
Statement (D): Acetyl CoA molecules enter into cyclic reactions during the Calvin cycle.
This statement is incorrect. Acetyl CoA does not enter into cyclic reactions during the Calvin cycle. The Calvin cycle, which is a part of photosynthesis, takes place in the chloroplasts of plants. It involves the fixation of carbon dioxide and the synthesis of glucose. Acetyl CoA, on the other hand, is primarily involved in cellular respiration and acts as a key intermediate in the oxidation of glucose.
Overall, the correct statements are (A) and (C).
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Which of the following statements are correct?(A) The oxidation of pyr...
Acetyl CoA is a 2-carbon compound and 3-phosphoglycerate molecule enter into cyclic reactions during Calvin cycle.
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Which of the following statements are correct?(A) The oxidation of pyruvic acid molecules formed in glycolysis occurs inside the mitochondria.(B) Acetyl CoA is a 3-carbon compound.(C) Under anaerobic conditions, the pyruvic acid formed during glycolysis is reduced to either ethyl alcohol or lactic acid.(D) Acetyl CoA molecules enter into cyclic reactions during Calvin cycle.a)(A) and (B)b)(C) and (D)c)(A) and (C)d)(B) and (C)Correct answer is option 'C'. Can you explain this answer?
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