The molecules NADH and FADH2 that are produced by glycolysis and the krebs cycle must move to the inner mitochondrial membrane to enter the electron transport chain.
About glycolysis:
The first process through which glucose is broken down to provide energy is known as glycolysis. Nearly all of the creatures on earth use this metabolic route, which was probably one of the first to emerge. Glycolysis is divided into two stages: First, the six-carbon glucose ring is prepared for splitting into two three-carbon sugars. ATP is used to fuel the separation throughout this portion of the process. In the second stage of glycolysis, hydrogen atoms are used to extract ATP and high-energy electrons that are then attached to NAD+. In the first half, two ATP molecules are used, and in the second, four ATP molecules are created through substrate phosphorylation. The result is a net gain for the cell of two ATP molecules and two NADH molecules.
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