4.3 Photosynthesis uses light energy to synthesize organic molecules.
You should be prepared to discuss...
(a) The distribution of chloroplasts in relation to light trapping. Chloroplasts as transducers converting the energy of light photons into the chemical energy of ATP. Light harvesting. Absorption of various wavelengths of light by chlorophyll and associated pigments and energy transfer to reaction centres.
(b) Basic features of Photosystems I and II. Cyclic and non-cyclic photophosphorylation sources of electrons for the electron transport chain. Photolysis as a source of electrons for Photosystem II. Reduction of NADP by addition of electrons and hydrogen ions; occurs in the stroma maintaining the proton gradient.
(c) Reduced NADP as a source of reducing power and ATP as a source of energy for the following reactions. The light independent stage and the formation of glucose; uptake of carbon dioxide by ribulose bisphosphate to form glycerate 3-phosphate catalysed by Rubisco. Reduction of glycerate 3-phosphate to triose phosphate (carbohydrate),
with the regeneration of ribulose bisphosphate. Other carbohydrates, lipids and amino acids can be made from the
triose phosphate. (No details of chemistry of these processes needed).
(d) The role of inorganic nutrients in plant metabolism as illustrated by the utilisation of nitrogen and magnesium.
(b) Basic features of Photosystems I and II. Cyclic and non-cyclic photophosphorylation sources of electrons for the electron transport chain. Photolysis as a source of electrons for Photosystem II. Reduction of NADP by addition of electrons and hydrogen ions; occurs in the stroma maintaining the proton gradient.
(c) Reduced NADP as a source of reducing power and ATP as a source of energy for the following reactions. The light independent stage and the formation of glucose; uptake of carbon dioxide by ribulose bisphosphate to form glycerate 3-phosphate catalysed by Rubisco. Reduction of glycerate 3-phosphate to triose phosphate (carbohydrate),
with the regeneration of ribulose bisphosphate. Other carbohydrates, lipids and amino acids can be made from the
triose phosphate. (No details of chemistry of these processes needed).
(d) The role of inorganic nutrients in plant metabolism as illustrated by the utilisation of nitrogen and magnesium.
Powerpoint used in class
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Revision powerpoint
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Photosynthesis overview
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Light dependent stage
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Light independent stage
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Test yourself photosynthesis - click here
Photosynthesis in music
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