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Photosynthesis - Lesson 2

Grade 12 Biology - 3.3 & 3.4

S Mahendran

on 11 December 2012

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Transcript of Photosynthesis - Lesson 2

Photosynthesis The Light Reactions The Details Photoexcitation
Electron Transport
Chemiosmosis Photoexcitation Chemiosmosis Process of producing ATP and NADPH from photosystems I and II The Calvin Cycle Used to regenerate RuBP
Structural and functional purposes
G3P --> glucose
High [glucose]
1/3 --> starch (amylose & amylopectin)
2/3 --> transported to other cells such as roots Alternative Mechanisms of Carbon Fixation Photorespiration decreases production of carbohydrates
Photosynthesis optimal temp = 15 - 25 degrees
Photorespiration optimal temp = 30 - 47 degrees
Dessert or tropical plants go through C4 or CAM photosynthesis Photosystems A cluster of chlorophyll, accessory pigments & proteins
Antenna pigment absorbs photon
Moves from pigment to pigment
Reaches chlorophyll a and e- becomes excited
2 types of photosystems: I (P700) & II (P680) e- in chlorophyll are at ground state
Photon raises the e- to a higher level = excitation
Excited e- is captured by a primary electron acceptor (PEA)
Chlorophyll loses e-, PEA gains e- (RED-OX) Occurs in the stroma
Converts CO to CH O
3 phases:
Carbon Fixation
Reduction Rxns
Regeneration of RuBP 2 2 G3P Leave Chloroplast Chloroplast: G3P from the Calvin Cycle
(Inside Chloroplast) Glucose

Starch Glucose Sucrose Cellulose
(cell walls) Cellular Respiration
Plants Cellular Respiration
Mitochondria For Next Class (In December): Complete handouts
Read Chapter 3
Any questions? Email me at 51sm28@queensu.ca
Have a Happy Halloween!
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