Multiple Choice
Which statement correctly distinguishes photosynthesis and cellular respiration?
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8. Respiration
Introduction to Cellular Respiration
Multiple Choice
What is the net ATP gain during glycolysis, the first stage of cellular respiration?
A
2 ATP
B
6 ATP
C
8 ATP
D
4 ATP
Verified step by step guidance1
Understand that glycolysis is the first stage of cellular respiration, occurring in the cytoplasm, where one glucose molecule is broken down into two molecules of pyruvate.
Recognize that glycolysis involves a series of ten enzymatic reactions, which can be divided into two phases: the energy investment phase and the energy payoff phase.
In the energy investment phase, 2 ATP molecules are used to phosphorylate glucose and its intermediates, preparing them for subsequent reactions.
In the energy payoff phase, 4 ATP molecules are produced through substrate-level phosphorylation, along with the reduction of NAD+ to NADH.
Calculate the net ATP gain by subtracting the ATP used in the energy investment phase from the ATP produced in the energy payoff phase: \( \text{Net ATP} = 4 \text{ ATP produced} - 2 \text{ ATP used} \).
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