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27 terms

Photosynthesis

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Pigment
molecule that absorbs light energy
Main photosynthetic pigment
Chlorophyll-concentrated in thylakoids of chloroplast
Smallest wavelength of light
violet
Longest wavelength of light
Red
Nutrition
a means of getting food
Heterotroph
must obtain food by consuming other organisms
Autotroph
make own food inside of yourself
Photosynthesis
using light energy to make food ( 6CO2 +6H2O yields (with light as catalyst) C6H12O6 + 6O2)
Chemosynthesis
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
Oxidation
loses electrons=loses energy=loses Hydrogen atoms
Transmitted Light
goes right through
reflected light
bounces back (green)
spectrophotometer
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
Photon
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