Bild1: The Cell TA: Xu Yu Zeng Office Hours Fridays 10am Centr 217A [email protected]Mon. Tap Ex 11am Photosynthesis Heterotrophs : Obtain organic material by consumption Autotrophs : Produce organic materials using CO 2 and environmental materials Photoautotrophs : Use light, CO 2 , H 2 O to make sugars Photosynthesis: Light energy used to build carbon-based molecules. O 2 released as waste Anabolic pathway where enzymes and light energy use CO 2 and H 2 O to build organic molecules, like glucose The reduction of organic molecules requires energy (∆G>0=nonspontaneous) 6CO 2 +6H 2 O+Light C 6 H 12 O 6 +6O 2 Chloroplasts : the organelle where photosynthesis takes place. Absorb all λ except green Photosynthesis occurs in 2 steps: Light reaction, Calvin Cycle Light Reaction : Harvests light energy to make chemical energy using e- flow. Occurs in thylakoids. 2 O to replenish e-, releases O 2 waste Light absorbed by chlorophyll in photosystems. Chlorophyll: pigment containing magnesium, serves as light receptor. Absorbed
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