LECTURE-14_Photosynthesis-1

LECTURE-14_Photosynthesis-1 - Photosynthesis-1 Lecture#16 s...

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Photosynthesis -1 Lecture #16 Campbell - Chapter 10; 181-200
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Lecture #15 - Objectives Recount the relationship between  autotrophs and hetrotrophs with respect to  the fate of O 2 , CO 2 , and H 2 O. Contrast  cellular respiration to photosynthesis  with respect to CH 2 O, O 2 , CO 2 , and H 2 O.
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Lecture #15 - Objectives Recount what is achieved biochemical  terms in the light dependent reaction and  the light independent reaction. Recall which biochemical reactions  occuring in the  thylakoids and the stroma. Describe photoexcitation.
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Lecture #15 - Objectives Name the molecules that link the light reaction  to the so called dark reaction (Calvin cycle). Differentiate between  Photosystem I and  Photosystem II and describe generally the flow of  electrons in the two systems. Understand the metabolic adaptations and physiology  of C3, C4, and CAM plants. 
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Plants provide the world’s organisms with food Plants produce carbohydrates by converting light  energy into chemical energy.  Photosynthesis is the process by which this  conversion takes place. 
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Autotroph Autotroph : A cell or an organism that uses C0 as it  sole carbon source, and that synthesizes all of its  carbon containing biomolecules from C0 2  and other  small inorganic molecules. Heterotroph : A cell or an organism that live on  carbon sources produced by other organisms. Plants are Autotrophs. Plants are photoautotrophs  in that they use light  energy to synthesize biomolecules.  
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A Biochemists View of the Ecosystem!
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Photosynthesis is a two-step process The light dependent reactions change the  electromagnetic energy from light into chemical bond  energy in the form of ATP and NADPH. 
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Photosynthesis is a two-step process The light independent reactions (Calvin cycle) use  energy in the form of chemical bond energy (ATP and  NADPH) to reduce organic compounds (CO 2 ) to form  glucose. 
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Chloroplasts Chloroplasts are the site of photosynthesis in plants. Chlorophyll is the green pigment  located within  chloroplasts. Light energy absorbed by chlorophyll drives the  synthesis of carbohydrates. 
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Pathways of Photosynthesis 6CO + 12H 2 O + h ν    C 6 H 12 O + 6O 2  + 6H 2 6CO + 6H 2 O + h ν    C 6 H 12 O + 6O 2 This looks like the reverse of respiration. However,  plants do not  make carbohydrate by reversing  respiration.
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