Multiple Choice
In the context of cellular respiration, where does glycolysis occur?
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8. Respiration
Glycolysis
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Why is glycolysis described as having an energy investment phase and an energy payoff phase?
A
Because it stores energy in the form of NADH without using ATP.
B
Because it initially consumes ATP and later produces ATP.
C
Because it only produces ATP without any initial energy input.
D
Because it requires oxygen to produce ATP.
Verified step by step guidance1
Glycolysis is the first step in the process of cellular respiration, where glucose is broken down to produce energy.
The process is divided into two phases: the energy investment phase and the energy payoff phase.
During the energy investment phase, ATP is consumed to phosphorylate glucose and its derivatives, preparing them for subsequent breakdown. This is an essential step to destabilize the glucose molecule, making it more reactive.
In the energy payoff phase, ATP is produced. This occurs when the phosphorylated intermediates are converted into pyruvate, releasing energy that is used to synthesize ATP from ADP and inorganic phosphate.
Additionally, NAD+ is reduced to NADH during glycolysis, storing energy that can be used later in the electron transport chain to produce more ATP.
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