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PHOTOSYNTHESIS STAGES 6CO 2 + 6H 2 O + light energy  C 6 H 12 O 6 + 6O 2 Stages of Photosynthesis: i.Absorb light energy (via pigments) ii.Convert light.

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Presentation on theme: "PHOTOSYNTHESIS STAGES 6CO 2 + 6H 2 O + light energy  C 6 H 12 O 6 + 6O 2 Stages of Photosynthesis: i.Absorb light energy (via pigments) ii.Convert light."— Presentation transcript:

1 PHOTOSYNTHESIS STAGES 6CO 2 + 6H 2 O + light energy  C 6 H 12 O 6 + 6O 2 Stages of Photosynthesis: i.Absorb light energy (via pigments) ii.Convert light energy  chemical energy iii.Convert chemical energy  organic compounds

2 CARBON DIOXIDE FIXATION CO 2 Fixation: the transfer of carbon dioxide to organic compounds, such as glucose aka. Light Independent Reactions or Calvin Cycle Calvin Cycle- most common method of CO 2 Fixation. A series of enzyme-assisted chemical reactions produce a 3- carbon sugar.

3 LIGHT INDEPENDENT REACTIONS Do these reactions occur in the daylight, night, or both? Input (s): Output (s):

4 STEPS OF CALVIN CYCLE 1.CO 2 is added to a 5-C compound via enzyme RuBisCO to make a 6-C compound. 2.The resulting 6-C compound splits into two 3- C compounds; phosphates from ATP and electrons from NADPH are added. 3.One of the 3-C compounds is used to make C 6 H 12 O 6, a sugar to store energy for plant. 4.The other 3-C compound gets recycled back into the mix to keep cycle going.

5 3 carbon simple sugar (recycled) organic compounds: sucrose, starch Unstable 6 carbon compound RuBi sCO + 5 carbon compound 3 carbon simple sugar (recycled) organic compounds: sucrose, starch Unstable 6 carbon compound RuBi sCO + 5 carbon compound

6 CARBOHYDRATE TERMS Monosaccharide: monomer of a carbohydrate Example: Glucose Disaccharide: polymer of a carbohydrate Example: Sucrose Polysaccharide: polymer of carbohydrate Example: Cellulose,

7 CARBOHYDRATES Composed of C, H and O atoms Ratio of carbohydrates is 1C: 2H: 1O

8 Monomer Glucose - Single ring Polymer Sucrose - two or more rings

9 DEHYDRATION SYNTHESIS

10 HYDROLYSIS + H 2 O


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