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ALL THE REACTIONS IN GLYCOLYSIS TAKE PLACE IN THE CELL CYTOPLASM (OUTSIDE THE MITOCHONDRION)

Glucose is a stable molecule containing 6 Carbon atoms

Glucose contains many C-H bonds and contains significant energy

During GLYCOLYSIS one glucose molecule is split into two PYRUVATE molecules.

Each PYRUVATE molecule contains three carbon atoms

As glucose is a stable molecule it must first be made into a less stable FRUCTOSE BISPHOSPHATE molecule before it can be broken down. This requires the input of energy

(2 x ATP)

FRUCTOSE BISPHOSPHATE is split into two TRIOSE PHOSPHATE molecules

The two TRIOSE PHOSPHATE molecules are converted into two GP molecules, releasing energy (2 x ATP), and Hydrogen. Hydrogen is picked up by NAD to form reduced NAD (redNAD). The Hydrogen is taken to the mitochochondria where is is used to generate

ATP by OXIDATIVE PHOSPHORYLATION

2GPs are converted into two PYRUVATE molecules releasing energy (2 x ATP).

Thus at the end of GLYCOLYSIS, one glucose mocule has generated

2 pyruvate molecules (to the LINK REACTION)

2 ATP molecules (2 input, 4 output)

2 red NAD molecules (to OXIDATIVE PHOSPHORYLATION)

NO CO₂ is produced by glycolysis

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Glycolysis and the Krebs cycle | a2-level-level-revision, biology, energy-life, respiration, glycolysis-and-krebs-cycle | Revision World

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Both processes produce ATP from substrates but the Krebs cycle produces many more ATP molecules than glycolysis! Every stage in each process is catalysed by a specific enzyme. In aerobic respiration both glycolysis and the Krebs cycle are involved whereas in anaerobic respiration only glycolysis takes place.

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What is respiration? | ATP and cells | Oxidation and reduction | Aerobic respiration | Glycolysis | Phosphorylation | The link reaction | The Krebs cycle | Oxidative phosphorylation | Anaerobic respiration (without oxygen) | Test your knowledge