Photosynthesis 1: The Light Reactions (Ch. 8)
Photosynthesis 1: The Light Reactions (Ch. 8)
Plant structure
? Chloroplasts
chloroplast
ATP
H+
HH+ H+ H+tHh+ y+Hla+HkHo++idHH++
? double membrane
? stroma ? fluid-filled interior
outer membrane
inner membrane
? thylakoid sacs
? grana stacks
stroma
? Thylakoid membrane contains
? chlorophyll molecules ? electron transport chain
thylakoid granum
? ATP synthase
? H+ gradient built up within thylakoid sac
Photosynthesis
? Light reactions
? light-dependent reactions
? convert solar energy to chemical energy
? ATP & NADPH
? Calvin cycle
? light-independent reactions
It's not the Dark Reactions!
? sugar building reactions
? uses ATP & NADPH to make C6H12O6
Light reactions
chloroplast
ATP
? Electron Transport Chain
? like in cellular respiration
? proteins in organelle membrane
? electron acceptors
? NADPH ? proton (H+)
gradient across inner membrane
? ATP synthase enzyme
thylakoid
H+ HH+H+H+H+ +H+HH++HH++ H+ HH+H+H+H+ +H+HH++HH++
Chloroplasts transform light energy into chemical energy of ATP
use electron carrier NADPH
generates O2
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