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PLANT 120 #14

PHOTOSYNTHESIS PT I

what is photosynthesis? making solar energy into biochemical; CO2 and H20 make sugars and organic molecules, O2 is a by-product
what's the formula? 6 CO2 + 12 H20 + light = C16H12O6 + 6O2 + 6H20
T or F: photosynthesis and respiration are inter-dependent TRUE BABY
where does respiration occur? in the mitochondria
what light is used in photosynthetic activity? visible light
what light (colours) does chlorophyll absorb? blue (430nm) and red (680nm)
what light is reflected? green
what colour is Chl A? blue-green
what colour is Chl B? yellow-green
which chlorophyll pigment is directly involved in light reactions? Chl A
what does/is chlorophyll b? its an accessory pigment the transfers light energy to Chlorophyll and makes photosynthesis occur over a broader spectrum of light
what colour are carotenoids? yellow-orange
what colour are phycobilins? blue-red
when are accessory pigments visible? only when chlorophyll a breaks down (in the fall time)
when are electrons excited? when the pigments absorb light
photo= light _________ reactions synthesis = light ___________ reactions dependent; independent (Calvin cycle/dark reactions)
where do light-dependent reactions occur? in the thylakoid membrane
where do light-independent reactions occur? in the stroma of chloroplasts
what are the products of light reactions? ATP and NADPH and O2
what is split in photo reactions? (light reactions) water
what is reduced in light reactions? NADP
when does ATP and NADPH get used to make sugars? in the light-independent (dark) reactions; Calvin cycle
what does carbon combine with to make glucose? RuBP
what does RuBP stand for? Ribulose bisphosphate
what absorbs light in the light-dependent reactions? chlorophylls pigments (a and b)
where are photosystem located? in the thylakoid during light reactions
T or F: Events in photosystem II occur before events in photosystem I TRUE
the reaction centre molecules psI is p700nm
the reaction centremolecule in psII p680nm
what makes the p700 special? its the only one that can actually use light energy
what are the two component of each phtotosystem? a reaction centre molecule and antenna pigment
how does chlorophyll a act differently in the reaction centre? it absorbs light at slightly longer wavelengths (lower energy)
what is the Z-scheme? the movement of electrons in a zig-zag pattern, constituting light reactions
what does photophosphorylation make? ATP
is PII cyclic or no =n-cyclic? non-cyclic
what is chemiosis? protons moving across the thylakoid membrane through protein channel, ATPase, producing ATP
Can PS1 work independently of PS2? Yes, its cyclic
PSII make s___________ and PSI makes ___________ ATP; NADPH
Created by: Rochelle117
 

 



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