Cell Biochemistry
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Manufacturing ATP

Manufacturing NADPH2

Cyclic Phosphorylation

Non Cyclic Phosphorylation

Calvin Cycle

Photosynthesis Worksheet

Photosynthesis Experiments


Manufacturing NADH2


Krebs Cycle

Electron Transport system

Respiration Worksheet

Respiration Experiment

First Stage: Glycolysis

Go to Krebs Cycle

In stage 1 (Glycolysis) each glucose molecule is broken down to form two Pyruvate (pyruvic acid) molecules. This occurs in the cell cytoplasm and in the process two ATP molecules are produced.

What happens next depends on the presence or absence of Oxygen:

If oxygen is absent then the second stage does not occur and the Pyruvate is changed into either lactic acid or ethanol and carbon dioxide. This is called Anaerobic Respiration and it produces only 2 ATP molecules.

If oxygen is present then Stage 2 takes place in the Mitochondrion of a cell. The following Movie will take you to the mitochondrion of a cell.

Respiration Experiments