Photosynthesis and Energy Supply

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Photosynthesis and energy supply
Photosynthesis stores energy in glucose
1. Photosynthesis is the process where energy from light is used to break apart the strong bonds in H2O
molecules this = hydrogen is combined with the CO2 to form glucose, and O2 is released into the atmosphere.
2. Photosynthesis occurs in a series of reactions, but overall the equation is:
3. So, energy is stored in the glucose until the plants release it by respiration
4. Animals obtain glucose by eating plants (or other animals), then respire the glucose to release energy.
Cells release energy from glucose by respiration
1. Plant and animal cells release energy from glucose ­ this process is called respiration
2. This energy is used to power all the biological processes in a cell
3. There are two types of respiration:
Aerobic respiration ­ respiration using oxygen
Anaerobic respiration ­ respiration without oxygen
4. Aerobic respiration produces carbon dioxide and water, and releases energy. The overall equation is:
Inorganic phosphate (Pi) is just the fancy term for a single phosphate.

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Key technical terms
Phosphorylation - adding phosphate to a molecule, e.g. ADP is phorphorylated to ATP
Photophosphorylation ­ adding phosphate to a molecule using light
Photolysis ­ the splitting (lysis) of a molecule using light (photo) energy
Hydrolysis ­ the splitting of a molecule using water (hydro) e.g. ATP is hydrolysed to ADP
Redox reactions ­ reactions that involve oxidation and reduction
Photosynthesis involves Coenzymes
1. A coenzyme is a molecule that aids the function on an enzyme.
2.…read more


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