Photosynthesis Overview Flashcards
1
Q
Photosynthesis
Photosynthetic organisms?
A
- plants
- algae
- protist (some)
- Cyanobacteria
all contain the pigment chlorophyll
2
Q
Photosynthesis Chloroplast Outer membrane? Inner membrane? Stroma? Thylakoids? Lumen? Granum?
A
- surface of the organelle
- protects organelle
- liquid containing enzymes for Calvin cycle
- membrane that forms grana
- space inside thylakoids
- where light absorption occurs
3
Q
Photosynthesis Chlorophyll? Chlorophyll a? Chlorophyll b? Hydrocarbon tail? Porphyrin portion?
A
- absorbs light
- blue/green pigment
- yellow/green pigment
- both composed of porphyrin ring attached to hydrocarbon tail*
- anchors molecule in granum
- Mg atom surrounded by hydrocarbon ring with double and single bonds
- electrons absorb light energy
- chlorophyll a has methyl (CH3) at top of ring
- chlorophyll b has aldehyde (-COH)
- group determines which type of light they absorb
4
Q
Photosynthesis
Cyanobacteria?
Endosymbiosis theory?
A
- blue/green algae
- unicellular, grow in colonies in water rock and soil
- blooms may be toxic to heterotroph
- first ever photosynthetic organism
- no membrane bound organelles but cell membrane folded to carry out PS and CR
-resemble chloroplasts and may have been engulfed by large eukaryotic cells
5
Q
Photosynthesis
Stomata?
A
-opening on surface of leaf, allow for gas exchange
-open in day, closed at night
- controlled by guard cells
Swell, stomata opens
Shrink, stomata closes
-water moves in/out of guard cell by osmosis
6
Q
Photosynthesis
Overall equation?
A
6 CO2 + 6 H2O ➡️ and sunlight = 6 O2 + C6H12O6
