LABORATORY REVIEW
CELL RESPIRATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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2
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4
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32
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34
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36
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Detailed explanation-1: -The Krebs cycle is the second phase in cellular respiration. It occurs in the mitochondria in the cell. The number of ATP molecules produced in the Krebs cycle is 2.
Detailed explanation-2: -Considering these 3 molecules of ATP, the total ATP synthesized by one turn of Krebs cycle is (12+3) i.e., 15 molecules of ATP.
Detailed explanation-3: -In the second reaction of the Krebs cycle, the isomerisation of citrate to isocitrate takes place. As an intermediate, cis-aconitate is formed. Therefore, it is a two-step reaction sequence.
Detailed explanation-4: -Because for each glucose molecule there are two pyruvic acid molecules entering the system, two ATP molecules are formed. Also during the Krebs cycle, the two carbon atoms of acetyl-CoA are released, and each forms a carbon dioxide molecule.
Detailed explanation-5: -In aerobic respiration, one glucose molecule results in a net ATP gain of 38 ATP. It comprises ATP generated during glycolysis, the link reaction, the TCA cycle, and oxidative phosphorylation in the electron transport system.