Photosynthesis Flashcards
adaptations of chloroplasts to photosynthesis
stroma (enzymes), grana (large SA- maximise light absorption), granum (stack of thylakoids)
what pigments are involved in photosynthesis?
chlorophyll A, chlorophyll B and carotenoids
what are 2 different photosystems and the absorption of wavelength of them?
Photosystem I - P700 (700nm)
Photosystem II - P680 (680nm)
products formed from light dependent reaction
ATP, NADPH
what is the process of ATP being formed
photophosphorylation
where does light dependent stage take place
in thylakoid lumen and stroma
what does the proton pump do
transports the protons acorss the thylakoid membrane from stroma to thylakoid lumen, creating a proton gradient
what does cyclic photophosphorylation involve
photosystem 1 only
what does non cyclic photophosphorylation involve
photsystem 2 and 1
what is photolysis?
when light energy causes a water molecule to split apart and release hydrogen ions, electrons and oxygen
how does the electron transport chain work?
energetic electrons are passed along a chain of electron carriers. The electron carriers are alternately reduced and then oxidised
what enzyme catalyses the fixation of CO2?
rubisco
what is the process of the calvin cycle?
GP (unstable intermediate) –> TP –> RuBP
what are uses for triose phosphate?
TP can condense to become hexose phosphates –> produce starch, sucrose or cellulose. TP –> converted to glycerol while GP can be converted to fatty acids. These molecules join together to form lipids for cell membranes. TP –> used in the production of amino acids for protein synthesis
three limiting factors affecting rate of photosynthesis
light intensity, carbon dioxide, temperature
