CELL RESPIRATION
GLYCOLYSIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A futile cycle of both pathways would waste how many ATP per cycle?
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4
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3
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6
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1
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Explanation:
Detailed explanation-1: -The cycle is balanced for CO2 and NADPH but consumes three ATPs.
Detailed explanation-2: -Overall, this cycle is metabolically costly: glycolysis produces 2 ATP molecules at a cost of 6 ATP molecules consumed in the gluconeogenesis.
Detailed explanation-3: -During glycolysis, glucose ultimately breaks down into pyruvate and energy; a total of 2 ATP is derived in the process (Glucose + 2 NAD+ + 2 ADP + 2 Pi–> 2 Pyruvate + 2 NADH + 2 H+ + 2 ATP + 2 H2O).
Detailed explanation-4: -A futile cycle, also known as a substrate cycle, occurs when two metabolic pathways run simultaneously in opposite directions and have no overall effect other than to dissipate energy in the form of heat.
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