Multiple Choice
What is the primary purpose of glycolysis in cellular respiration?
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8. Respiration
Glycolysis
Multiple Choice
What is the net gain of ATP molecules produced per molecule of glucose during glycolysis?
A
2 ATP
B
4 ATP
C
1 ATP
D
0 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: During glycolysis, 4 ATP molecules are generated in the energy payoff phase through substrate-level phosphorylation.
Determine the net gain of ATP: Subtract the 2 ATP molecules used in the energy investment phase from the 4 ATP molecules produced in the energy payoff phase. The net gain is the difference between ATP produced and ATP consumed.
Conclude the net ATP gain per glucose molecule: The net gain of ATP molecules per molecule of glucose during glycolysis is the result of the calculation in the previous step.
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