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Photosynthesis Cheat Sheet (DRAFT) by

Guide to photosynthesis

This is a draft cheat sheet. It is a work in progress and is not finished yet.


building up small orgainc molecules into complex molecules
Organic molecules Sugars come from ?
inorganic molecules, carbon dioxide and water


Photos­ynt­hesis is where energy from light is used to make glucose
From H2O and CO2
Occurs in a series of reactions
Energy is stored in glucose till plant releases it by respir­ation
Animals obtain glucose by eating plants


Release of energy stored in glucose = Respir­ation
Cant use glucose for energy
Energy released from glucose used to make ATP

Biosyn­hetic Pathway

Metabolic Pathway
sequence of linked chemical reactions
product of reactions in metabolic pathway

Phot­osy­nthesis Metabolic Pathway

2 Stages
Light Dependent Reaction-makes ATP
Calvin Cycle - consumes ATP to make glucose

Optimising Photos­ynt­hesis

High internsity at a certain wavelength
temper­ature effects enzymes and stomata
Carbon Dioxide
to much or to little affects photos­ynt­heisis


organisms that produce their own carbon materials

Uses of Energy

Muscle Contra­ction
Body Temper­ature
DNA replic­ation


Location of Photos­ynt­hesis
Photos­ynt­hetic Pigments absorb light


ATP is the immediate energy source in a cell
Cells can't get energy from glucose
ATP diffuses into part of the cell that needs energy
Adenine + ribose sugar+ 3 phosphate groups = ATP
ATP broken into ADP and Pi for energy
Phosphate bond broken = Energy Released
Hydrolysis Reaction

ATP Energy Source Benefits

No energy wasted as heat
Easily broken down
Easily transp­orted round the cell
Stays in the cell

Conden­sation Reaction

ATP comes from a conden­sation reaction between ADP and inorganic phosphate.

CO Enzyme NADP

Co-Enzyme aids enzymes
Coenzyme in Photos­ynt­hesis NADP
Transfers Hydrogen from one molecule to another
Reduction and Oxidation (OILRIG)
Gives Hydrogen to/Take Hydrogen from