Unit 3 – Lecture 8. Photosynthesis Photosynthesis: the process used by autotrophs which changes...
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Transcript of Unit 3 – Lecture 8. Photosynthesis Photosynthesis: the process used by autotrophs which changes...
Unit 3 – Lecture 8
PhotosynthesisPhotosynthesis: the process used by
autotrophs which changes solar energy, water [H2O], and carbon dioxide [CO2] into glucose [C6H12O6] and oxygen [O2]
Equation for Photosynthesis: E + H2O +CO2 C6H12O6 + O2
Photosynthesis – cont’dtakes place in the chloroplasts of the cell
“chloro” – green [pale green]contain green pigment, chlorophyll
“phyll / phyllos” = leafchloroplasts are FILLED with
chloroPHYLL
Light Dependent Reactionssunlight
transfers a photon of solar energy to
chlorophyll in the chloroplast
which exites an electron
e- gets knocked out of placement
Light Dependent Rxns – cont’de- travels down the Electron Transport Chain
[also called Electron Transport System]
as e- travels, it loses E
that E splits H2O [called photolysis] into
Oxygen [O2] Gas and Hydrogen [H+] Ions
which is released into the atmosphere
Light Dependent Rxns – cont’d… Hydrogen [H+] Ions…
which either
bonds with NADP+ is pumped into the thylakoid
to form NADPH
to form a gradient of which goes to the light charge AND independent reactions concentration
[called electrochemical
gradient]
Light Dependent Rxns – cont’d…ElectroChemical Gradient…
which causes the H+ ions to funnel through
the ATP Synthase
to form a small amountof ATP
Light Dependent Rxns – cont’d…to form a small amount of ATP…
which goes on to the Light Independent Reactions
Summing it up…Equation: E + H2O +CO2 C6H12O6 + O2
of the things in our equation…which things are input or formed in the light dependent reactions of photosynthesis?input: energy + water formed: oxygen gas
ATP SynthaseHydrogen Ions are pumped into the thylakoid
membrane after water is split…ions form electro-
chemical gradientions funnel through
ATP synthaseturns “crank”
energy from turningmakes ADP+P intoATP
Light Independent Reactionsaka Dark Reactions or Calvin Cycle
can occur in the LIGHT or the dark[light rxns can only occur when there is
sunlight]
The Calvin Cycle
Light Indep. Rxns – cont’dWhat you NEED to know:
can occur with or without light presentcomposed of the calvin cycleCarbon dioxide (CO2) is taken in and
combined with the H+ from NADPH (using ATP) to make Glucose (C6H12O6).
leftovers – ADP and NADP+ go back to light dependent reactions
Summing it up…Equation: E + H2O +CO2 C6H12O6 + O2
of the things in our equation…which things are input or formed in the light INdependent reactions of photosynthesis?input: carbon dioxide [and some water]formed: glucose
Overview - Photosynthesissolar
energy [photon]
ATP
NADPH
NADP+
ADP
H2O
a little bit of H2O
CO2
O2
C6H12O6
thylakoids
stroma
IMPORTANT!!Be sure to know:
what goes inwhere that came from
what goes outwhere that’s going