Photosynthesis Flashcards
Phosphorylation and photophosphorylation
Adding phosphate molecules
Adding phosphate molecule using light
Photolysis
Splitting (lysis) of molecule using light energy
Photoionisation
When light energy excites electrons in an atom giving them more energy causing them to be released
Chloroplast
- chorophyll
- thylakoid
- grana
- lamellea
- stroma
Light dependent summery
- needs light
- electrons excited
- electrons released and energy
- phosphate added to ADP to make ATP and reduce NADP
- hydrogen transferred
Light independent reaction summary
- Calvin cycle
- relays on products from light dependent reaction
- in stroma
- atp and reduced NADP supply energy and H for simple sugars from CO2.
Photophosphorylation: cyclic and non-cyclic
Non- cyclic - produces atp reduced NADP and o2
Cyclic - produces atp
where does the lift independent reaction take place
stroma
DCPIP
- blue when oxidised
- ## colourless when reduced (by electrons)
What is DCPIP and How can DCPIP decolorisation be inhibited ?
- chemical that shows the rate of photosynthesis
- less atp
- less reduced nadp
- less GP to TP
LDP KEY POINTS IN ORDER
- photons hit chloroplast
- electrons excited so move down ETC but lose energy
- energy used for active - T of H+ ions up conc gradient into thylakoid
- h+ from photolysis reduces nadp
- h+ diffuse through atp synthase to produce atp for Calvin cycle
LIP CALVIN CYCLE KEY POINTS
- rubisco enzyme catalyses reaction between CO2 and RuBP
- Glycerate-3-phosphate formed from unstable 6 carbon compound.
- ATP nd RNADP from LDR convert GP into TRIOSE PHOSPHATE (2X 3C)
- one carbon is released from the cycle from TP and the other 5 carbons are made into RuBP by ATP
- cycle happens 6x t make one hexose sugar
Photoionisation during LDR
- Chlorophyll absorbs light
- light excited electrons
- electrons lost
- chlorophyll positively charged
Advantage of diferent pigments in leaves
Absorbs different wavelengths for photosynthesis
Where is rubisco found
Storms in chloroplast
