AP and Pre-AP Biology Serrano High School Photosynthesis AP and Pre-AP Biology Serrano High School

The Equation 6CO2 + 6H2O + light  C6H12O6 + 6O2 Chlorophyll required Water both consumed & produced

Chloroplasts Site of photosynthesis Structure Double membrane Thylakoids Granum (Stack of thylakoids) Stroma

Chloroplasts Relating structure to function Thylakoid space Allows for accumulation of H+ Segregates H+ from rest of organelle

Chloroplasts Relating structure to function Thylakoid membrane Contains photosystems & ETC

Chloroplasts Relating structure to function Large number of thylakoids Large surface area Large number of ETC and photosystems

Chloroplasts Relating structure to function Inner membrane Segregates chemical of Calvin-Benson cycle from cytosol

Photosynthesis

Light Reactions

Light Reactions Photosystem II captures light energy P680

Light Reactions Light energy passed to reaction center P680

Light Reactions 2 e- boosted to higher energy state P680

Light Reactions 2 e- passed through ETC to Photosystem I H+ gradient created; ATP produced ATP P700 P680

Light Reactions Photosystem I captures light energy Passes it to reaction center ATP P700 P680

Light Reactions e- from P700 boosted to higher energy state P700 P680 ATP P700 P680

Light Reactions e- move through ETC e- accepted by NADP+ NADP+ P700 ATP NADP+ P700 P680

Light Reactions 2e- + 1H+ + NADP+  NADPH ATP NADP+ NADPH P700 P680

Light Reactions Water split e- from water replace lost e- from P680 O2 leaves ATP NADPH H2O O2 P700 H+ P680

Calvin Cycle

Calvin Cycle Rubisco fixes 6CO2 to 6RuBP (5-C) RuBP = ribulose biphosphate 3PG (3-C) produced 3PG = 3-phosphoglycerate

Calvin Cycle 3PG converted to 12 G3P G3P = glyceraldehyde 3-phosphate 12 ATP used 12 NADPH used

Calvin Cycle 2 G3P exit cycle & used to make glucose Glucose used to make sugars & other carbohydrates

Calvin Cycle 10 G3P (3-C) used to make 6 RuBP (5-C) 6 ATP used