Multiple Choice
Which carbohydrate serves as the initial substrate for glycolysis?
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8. Respiration
Glycolysis
Multiple Choice
What is the net gain of ATP molecules per molecule of glucose during glycolysis?
A
2 ATP
B
4 ATP
C
0 ATP
D
1 ATP
Verified step by step guidance1
Understand the process of glycolysis: Glycolysis is the first step in cellular respiration, where one molecule of glucose (C₆H₁₂O₆) is broken down into two molecules of pyruvate. This occurs in the cytoplasm and does not require oxygen.
Identify the ATP usage and production during glycolysis: Glycolysis involves an initial investment of 2 ATP molecules during the energy investment phase to phosphorylate glucose and prepare it for breakdown.
Calculate the ATP produced: During the energy payoff phase of glycolysis, 4 ATP molecules are generated through substrate-level phosphorylation.
Determine the net gain of ATP: Subtract the ATP used (2 ATP) from the ATP produced (4 ATP) to find the net gain. Use the formula:
Review the options provided in the question: Compare the calculated net gain of ATP to the answer choices (2 ATP, 4 ATP, 0 ATP, 1 ATP) to identify the correct answer.
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