LABORATORY REVIEW
CELL RESPIRATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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1 ATP, 2 CO2, 3 NADH, and 1 FADH2
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6 ATP, 12 CO2, 18 NADH, and 6 FADH2
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3 ATP, 6 CO2, 9 NADH, and 3 FADH2
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I have never heard of the citric acid cycle
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Detailed explanation-1: -A total of four CO2, six NADHs, two FADH2, and two ATPs are made through the citric acid cycle. NADH and FADH2 are electron carriers that can produce more ATPs later in aerobic respiration.
Detailed explanation-2: -Therefore, for every glucose molecule (which generates two acetyl-CoA molecules), the citric acid cycle yields four carbon dioxide molecules, six NADH molecules, two FADH2 molecules, and two GTP/ATP molecules. The citric acid cycle also regenerates oxaloacetate, the molecule that starts the cycle.
Detailed explanation-3: -In the sixth step, succinate is converted to fumarate; here, a dehydrogenation takes place because two protons are removed. FAD serves as coenzyme wich is bound covalently to the enzyme succinate dehydrogenase, so that usually the notation E-FAD is used.
Detailed explanation-4: -To start the cycle, an enzyme fuses acetyl CoA and oxaloacetate together so that citric acid is formed (a 2-carbon molecule + a 4-carbon molecule = a 6-carbon molecule!). This is the first molecule that is made in the cycle and is where the cycle gets its name.