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Lecture 24

BIOL 1012 Lecture Notes - Lecture 24: Cellular Respiration, Chemiosmosis, Light-Independent Reactions

Course Code
BIOL 1012
Suman Batish

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Bio 3/22
ATP and NADPH power sugar synthesis in the Calvin cycle
o The Calvin cycle makes sugar within a chloroplast
o To produce sugar, the necessary ingredients are
Atmospheric CO2
ATP and NADPH generated by the light reactions
o The Calvin cycle uses these three ingredients to produce an
energy rich, three carbon sugar called G3P
o Plant uses G3P to make
Other organic molecules as needed
o Steps of the Calvin cycle include
Carbon fixation
Release of one molecule of G3P
Regeneration of the starting molecule, ribulose
biphosphate (RuBP)
o Photosynthesis is an emergent property of the structural
organization of a chloroplast, which integrates the two stages of
Photosynthesis makes sugar from CO2 and H2O, providing food and O2
for almost all living organisms
o Two photosystems in the thylakoid membranes capture solar
energy, energizing electrons in chlorophyll molecules
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