LABORATORY REVIEW
CELL RESPIRATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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2 ATP
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4 ATP
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6 ATP
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8 ATP
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Detailed explanation-1: -The energy to split glucose is provided by two molecules of ATP. As glycolysis proceeds, energy is released, and the energy is used to make four molecules of ATP.
Detailed explanation-2: -Key Points. Although four ATP molecules are produced in the second half, the net gain of glycolysis is only two ATP because two ATP molecules are used in the first half of glycolysis.
Detailed explanation-3: -In the first step, glucose ⇢ glucose-6-phosphate, ATP is used and gets converted into ADP. Similarly, in the third step, fructose-6-phosphate ⇢ fructose-1, 6-biphosphate, ATP is used. Thus, two ATPs are used in the first three steps of glycolysis. Hence, to split the glucose 2 molecules of ATPs are used.
Detailed explanation-4: -For every molecule of glucose synthesized from two molecules of pyruvate, 4 ATP, 2 GTP, and 2 NADH are used.
Detailed explanation-5: -The citric acid cycle produces 36 ATP molecules. So, in aerobic respiration, a total of 38 molecules of ATP are created, with 2 ATP molecules formed outside the mitochondria.