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molecule that absorbs light energy

Main photosynthetic pigment

Chlorophyll-concentrated in thylakoids of chloroplast

Smallest wavelength of light


Longest wavelength of light



a means of getting food


must obtain food by consuming other organisms


make own food inside of yourself


using light energy to make food ( 6CO2 +6H2O yields (with light as catalyst) C6H12O6 + 6O2)


using chemicals to make food (H2S)

2 Step process of photosynthesis

1) Light Dependent Reaction 2) Light Independent Reaction

Light Dependent Reaction

takes place on thylakoid membrane (needs light)

Light Independent Reaction

takes place in stroma (does not need light) (calvin cycle)

Electron Carriers

molecules that transport electrons

Reduction Reactions

gains electrons=gains energy=gains Hydrogen atoms


loses electrons=loses energy=loses Hydrogen atoms

Transmitted Light

goes right through

reflected light

bounces back (green)


mesuring how much light is being transmitted

High transmittance

low absorption-ex. green light

Low transmittance

high absorption-ex. blue light

porphyrin ring

light absorbing "head" of molecule


a package of light

antenna pigment molecules

receives transfer of energy from the photon's energy (could be chlorophyll b, xanthophyll, etc.)

primary electron acceptor

receives energy from excited electrons

reaction centre chlorophyll

is chlorophyll a, receives energy and is generally in center of the photosystem

Light Reactions

are carried out by molecules in the thylakoid membranes, convert light energy to the chemical energy of ATP and NADPH, split H2O and release O2 to the atmosphere

Calvin Cycle Reactions

take place in the stroma, use ATP and NADPH to convert CO2 to the sugar G3P, returns ADP, inorganic phosphate, and NADP+ to the light reactions

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