QQuestionBiology
QuestionBiology
"Which statement describes ATP consumption and production during the preparatory and payoff phases of glycolysis, respectively?
A. Two ATP molecules consumed, four ATP molecules produced
B. Four ATP molecules consumed, eight ATP molecules produced
C. Four ATP molecules consumed, two ATP molecules produced
D. Eight ATP molecules consumed, four ATP molecules produced"
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Answer
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Step 1:Let's solve this step by step by carefully analyzing the ATP changes during glycolysis.
Step 2:: Understanding Glycolysis Phases
Glycolysis consists of two main phases: - Preparatory (Investment) Phase - Payoff (Splitting) Phase
Step 3:: ATP Consumption in Preparatory Phase
- $$2 \text{ ATP molecules are consumed}
During the preparatory phase, glycolysis requires energy investment: - These ATP molecules are used to phosphorylate glucose and prepare it for splitting
Step 4:: ATP Production in Payoff Phase
- The net ATP gain is $$4 - 2 = 2 \text{ ATP molecules}
During the payoff phase: - This occurs through substrate-level phosphorylation
Step 5:: Analyzing the Options
Comparing the ATP consumption and production: - Two ATP consumed in preparatory phase - Four ATP produced in payoff phase
Final Answer
Two ATP molecules consumed, four ATP molecules produced This matches the actual ATP dynamics during glycolysis, representing the net energy gain of the metabolic process.
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