Ch. 10 Photosynthesis: The Calvin Cycle Life from Air
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1 Ch. 10 Photosynthesis: The Calvin Cycle Life from Air
2 Whoops! Wrong Calvin The Calvin Cycle 1950s 1961
3 Remember what it means to be a plant Need to produce all organic molecules necessary for growth carbohydrates, lipids, proteins, nucleic acids Need to store chemical energy (ATP) produced from light reactions in a more stable form that can be moved around plant saved for a rainy day carbon + water + energy glucose + oxygen dioxide 6CO 2 + 6H 2 O + light C 6 H 12 O 6 6O energy + 2
4 Light reactions Convert solar energy to chemical energy ATP energy ATP NADPH reducing power What can we do now? build stuff!! photosynthesis
5 How is that helpful? Want to make C 6 H 12 O 6 synthesis How? From what? What raw materials are available? CO 2 carbon fixation NADPH NADP reduces CO 2 C 6 H 12 O 6 NADP
6 From CO 2 C 6 H 12 O 6 CO 2 has very little chemical energy fully oxidized C 6 H 12 O 6 contains a lot of chemical energy highly reduced Synthesis = endergonic process put in a lot of energy Reduction of CO 2 C 6 H 12 O 6 proceeds in many small uphill steps each catalyzed by a specific enzyme using energy stored in ATP & NADPH
7 From Light reactions to Calvin cycle Calvin cycle chloroplast stroma Need products of light reactions to drive synthesis reactions ATP NADPH stroma ATP thylakoid
8 starch, sucrose, cellulose & more = = Calvin cycle 3. Regeneration of RuBP RuBP 5C ribulose bisphosphate 3 ATP 3 ADP used to make glucose H H H C C C H H H C C C C C C 5C 3C 6 NADP 2. Reduction C 1C CO 2 RuBisCo ribulose bisphosphate carboxylase glyceraldehyde-3-p G3P PGA phosphoglycerate 1. Carbon fixation 3C 6 ATP 6 NADPH 6 ADP C 3C C 6C
9 Remember G3P? glycolysis glucose C-C-C-C-C-C fructose-1,6bp P-C-C-C-C-C-C-P 2 2 ATP ADP DHAP P-C-C-C G3P C-C-C-P glyceraldehyde 3-phosphate 2 2 NAD + 4 ADP Photosynthesis pyruvate C-C-C 4 ATP
10 To G3P and Beyond! To G3P and beyond! Glyceraldehyde-3-P end product of Calvin cycle energy rich 3 carbon sugar C3 photosynthesis G3P is an important intermediate G3P glucose carbohydrates lipids phospholipids, fats, waxes amino acids proteins nucleic acids DNA, RNA
11 RuBisCo Enzyme which fixes carbon from air ribulose bisphosphate carboxylase the most important enzyme in the world! it makes life out of air! definitely the most abundant enzyme I m green with envy! It s not easy being green!
12 Accounting The accounting is complicated 3 turns of Calvin cycle = 1 G3P 3 CO 2 1 G3P (3C) 6 turns of Calvin cycle = 1 C 6 H 12 O 6 (6C) 6 CO 2 1 C 6 H 12 O 6 (6C) 18 ATP + 12 NADPH 1 C 6 H 12 O 6 any ATP left over from light reactions will be used elsewhere by the cell
13 Photosynthesis summary Light reactions produced ATP produced NADPH consumed H 2 O produced O 2 as byproduct Calvin cycle consumed CO 2 produced G3P (sugar) regenerated ADP regenerated NADP ADP NADP
14 Light Reactions H 2 O + light ATP O energy + NADPH + 2 sunlight H 2 O Energy Building Reactions NADPH ATP produces ATP produces NADPH releases O 2 as a waste product O 2
15 Calvin Cycle CO 2 + ATP + NADPH C 6 H 12 O 6 + ADP + NADP ADP NADP NADPH ATP CO 2 Sugar Building Reactions builds sugars uses ATP & NADPH recycles ADP & NADP back to make more ATP & NADPH sugars
16 Putting it all together CO 2 + H 2 O + energy light C 6 H 12 O 6 + O 2 sunlight H 2 O Energy Building Reactions ADP NADP NADPH CO 2 Sugar Building Reactions Plants make both: energy ATP & NADPH sugars ATP O 2 sugars
17 Energy cycle sun even though this equation is a bit of a lie it makes a better story CO 2 H 2 O Photosynthesis CO + 2 H 2 O + energy light C 6 H 12 O + 6 O 2 plants animals, plants ATP C 6 H 12 O 6 + O 2 energy + CO 2 + H 2 O Cellular Respiration glucose O 2 The Great Circle of Life,Mufasa! ATP
18 Summary of photosynthesis Where did the CO 2 come from? Where did the CO 2 go? Where did the H 2 O come from? Where did the H 2 O go? Where did the energy come from? What s the energy used for? What will the C 6 H 12 O 6 be used for? Where did the O 2 come from? Where will the O 2 go? What else is involved not listed in this equation? 6CO 2 + 6H 2 O + light C 6 H 12 O 6 6O energy + 2
19 Supporting a biosphere On global scale, photosynthesis is the most important process for the continuation of life on Earth each year photosynthesis captures 121 billion tons of CO 2 synthesizes 160 billion tons of carbohydrate heterotrophs are dependent on plants as food source for fuel & raw materials
20 The poetic perspective All the solid material of every plant was built by sunlight out of thin air All the solid material of every animal was built from plant material air sun Then all the plants, cats, dogs, elephants & people are really particles of air woven together by strands of sunlight!
21 If plants can do it You can learn it! Ask Questions!!
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