november 13, 2012 o write out the overall reaction of photosynthesis
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November 13, 2012O Write out the overall reaction of
photosynthesis
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Announcements
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Review of PhotosynthesisO At your tables pull out your notes and
come up with answers to these questions.
O What is Photosynthesis?
O Where does the mass of a plant come from as it grows?
O What are the reactants of Photosynthesis (what goes in)? What are the products (what comes out)?
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How does photosynthesis really work?
O Plants capture sunlight using light absorbing molecules called pigments.
O Chlorophyll: is found in chloroplast, is the principal pigment for capturing sunlight.
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ChlorophyllO There are two types of
chlorophyll (A and B) and each captures different wave lengths of UV light.
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Photosynthesis can be broken up into three
steps1. Light dependent reactions2. Electron Transport Chain3. Light independent reactions (Calvin
Cycle)
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The anatomy of a ChloroplastsO Thylakoids are saclike membranes
which contain the chlorophyll. These are arranged in stacks called grana.
O This is where the light-dependent reactions occur.
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Chloroplast anatomy O The stroma is the region outside the
thylakoid membranes. This is where the light-independent reactions take place.
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Light-Dependent Reactions
O Light-dependent reactions require light to function, and produce three major products.O OxygenO ATPO NADPH
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Products of the Light-dependent reactions
O These products are used to conduct the processes in the light-independent reactions.
Light-dependent
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ATPO ATP is a unit of cellular energy
responsible for transferring energy within the cell for metabolism
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NADPHO This is an electron carrier used to
transfer energy.
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Electron Transport Chain
OElectron transport chains are the cellular mechanisms used for taking energy from sunlight.
OThis requires electron Carriers like NADPH
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Light-independent Reactions
O Light-independent reactions take place in the stroma, outside of the thylakoid membrane
O The Calvin Cycle uses ATP NADPH from the previous reactions to produce high-energy sugars.
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Calvin CycleO Begins with six CO2 molecules and
ATP to create a six carbon sugar (C6H12O6).
Calvin Cycle