5304827
Photosynthesis
- General
- Definition: A process that converts
atmospheric CO2 & H2O to
carbohydrates.
- Oxgenic Photosynthesis
- Light energy transfers electrons
from H2O to CO2, which produces
carbohydrates.
- In this transfer, the CO2 is "reduced,"
or receives electrons, and the H2O
becomes "oxidized," or loses
electrons.
- O2 is produced along with carbohydrates.
- 6CO2 + 12H2O + Light Energy → C6H12O6 + 6O2 + 6H2O
- Light energy transfers electrons
from H2O to CO2, which produces
carbohydrates.
- Anoxygenic Photosynthesis
- Uses electron donors other than H2O.
- Typically occurs in bacteria (purple bacteria &
green sulfur bacteria)
- CO2 + 2H2A + Light Energy → [CH2O] + 2A + H2O
- Uses electron donors other than H2O.
- Oxgenic Photosynthesis
- Definition: A process that converts
atmospheric CO2 & H2O to
carbohydrates.
- Chloroplast structure and thylakoid membrane
- Thylakoid membrane
- Site for light reaction
- Compose of phospholipid and galactolipids
- Disc shape membrane
- Place for light being converted to food
- Stacks of thylakoid formed Grana
- Chloroplast structure
- Sites for photosynthesis
- Double membrane
- Disc shape organelles
- Contains chlorophyll
- Sites for photosynthesis
- Location
- Mesophyll layer
- Ground tissues
- Mesophyll layer
- Green in colour
- Thylakoid membrane
- Pigment molecules absorb light
- Pigments absorb
only specific
wavelengths of
visible light, while
reflecting others
- Chlorophyll
- Chlorophyll a
- All photosynthetic
plants, algae and
cyanobacteria
contain it
- All photosynthetic
plants, algae and
cyanobacteria
contain it
- Chlorophyll b
- Only plants
,green algae and
some unusual
types of
cyanobacteria
contain it
- Only plants
,green algae and
some unusual
types of
cyanobacteria
contain it
- Hydrophobic tail
inserts into
thylakoid
membrane
- Porphyrin
head(surrounding
a magnesium ion)
that absorbs light
- Chlorophyll a
- Accessory pigments
- beta-carotene
- Absorbs violet,
blue-green light;
reflects yellow,orange
- Important to dissipate
excess solar energy as
heat(photoprotection)
- Absorbs violet,
blue-green light;
reflects yellow,orange
- Phycobilins
- water-soluble,
found in
cytoplasm or
stroma of
chloroplast
- Phycocyanin
- bluish pigment,
cyanobacteria
- bluish pigment,
cyanobacteria
- Phycoerythrin
- reddish pigment,
red algae
- reddish pigment,
red algae
- Soak up light
energy, use as
chemical tags
- water-soluble,
found in
cytoplasm or
stroma of
chloroplast
- beta-carotene
- Pigments absorb
only specific
wavelengths of
visible light, while
reflecting others
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