AQA A-Level PE Energy Systems Practice Exam

Glycolysis yields a net of how many ATP per glucose?

Four Three Zero Two

Correct Answer:

Two

Explanation:

Glycolysis shows energy accounting where you invest ATP upfront and then harvest more ATP later. For one glucose, two ATP are spent in the early steps to activate the sugar, and four ATP are produced later during the payoff phase (two ATP per split product). So the net ATP yield from glycolysis itself is 2 ATP per glucose. It also generates 2 NADH, which can contribute additional ATP later in respiration depending on cellular conditions, but the direct glycolysis net is two ATP. The numbers don’t add up to four or zero, and they aren’t three because of that initial energy investment.

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