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Photosynthesis (LIGHT REACTION (Sunlight hits and splits the water in the…
Photosynthesis
LIGHT REACTION
Sunlight hits and splits the water in the stroma. It also hits the photosystems I and II.
The trapped H+ (protons) are released through ATP Synthase Complex, with their kinetic energy making ATP.
Electrons travel down the electron transport chain, creating NADPH.
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3rd Step
In Thylakoid
Happens in Stroma
H+
H+
e-
e-
O
1st Step
2nd Step
e-
e-
NADPH
H+
NADP
H+
H+
H+
H+
ATP
Thylakoid Interior
ADP + P
1)
CO2 is added to RuBP with the help of an enzyme (rubisco), and three unstable six-carbon molecules are formed.
P
P
3 x RuBP
P
P
P
NADPH
ATP
&
ADP + P
&
NADP+
CALVIN CYCLE
P
P
5 x G3P
6 x G3P
6 x 3-PGA
3 x
2)
The three six-carbon molecules break into six three-carbon molecules (3-PGA).
3)
ATP and NADPH from the light reaction provide energy and electrons to convert the 3-PGA to G3P.
1 x G3P exits
4)
Carbon exits the cycle in one molecule of G3P. It will later be used to make glucose and other compounds.
5)
Fifteen carbon atoms remain in five G3P molecules.
6)
G3P is rearranged to RuBP thanks to ATP an enzymes. ADP and NADP+ return to the light reaction.
1) What is made at the end of the light reaction?
Oxygen (a bi-product) and energy in the form of ATP and NADPH. The energy will later be used in the Calvin Cycle.
2) What is made at the end of the Calvin Cycle?
Glucose (the reason for photosynthesis) and ADP and NADP (which will return to the light reaction to be recycled).
