Back to AI Flashcard MakerBiology /OCR Biology A - 5.2.1 - Photosynthesis Part 2
Chloroplast membrane
Both inner and outer membrane
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Key Terms
Term
Definition
Chloroplast membrane
Both inner and outer membrane
Integranal lamellae
Extension of thylakoid membrane Acts as skeleton
Intermembrane space
Space between membranes (10-20nm)
Granum
Stack of thylakoids Plural grana
Stroma
Contains enzymes needed for photosynthesis, DNA and ribosomes
Thylakoids
Where the green pigment is found | Site of light absorption and ATP synthesis
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| Term | Definition |
|---|---|
Chloroplast membrane | Both inner and outer membrane |
Integranal lamellae | Extension of thylakoid membrane Acts as skeleton |
Intermembrane space | Space between membranes (10-20nm) |
Granum | Stack of thylakoids Plural grana |
Stroma | Contains enzymes needed for photosynthesis, DNA and ribosomes |
Thylakoids | Where the green pigment is found | Site of light absorption and ATP synthesis |
Chromatogrophy table | Pigment Distance travelled by compound Distance travelled by solvent Rf value |
Paper chromatogrophy to seperate pigments | Dissolve pigments in solvent (propan-2-ol) Using chromatography paper Allow the solvent to move up the paper and seperate the pigments Diff pigments would move at diff speeds up the paper Calculate Rf values |
Why do plants contain a mixture of diff pigments | Light is made up of many diff wavelengths | To allow plants to absorb maximum light for photosynthesis |
Photophosrylation | Production of ATP in the presence of light from ADP and Pi |
ATP | Adenosine tri-phosphate | Formed from inorganic phosphate and ADP during photophosphorylation |
NADP | Co.enzyme reduced to NADPH by the addn. of protons and electrons at the end of the light dependent stage |
Photolysis | 2H2O ---> 4 H+ and 4 e- and O2 H+ and e- used in photophosphorylation O2 used in respiration and/or released |
Non cyclic photophosphorylation | Involves PSII and PSI | Produces ATP, oxygen and reduced NADP |
Cyclic photophosphophorylation | Involves PSI | Produces ATP in smaller amounts. No photolysis involved so no protons or oxygen produced |
Process of cyclic photophosphorylation | Light hits a chlorophyll molecule in PSI and e- in primary pigment is raised to a higher energy level until it leaves Passed along electron transport chain and energy is released in small amounts to pump H^+ into the thylakoids disc Builds up conc. gradient Diffuse back out through specialised channels attached to ATP synthase Movement provides energy to combine ADP and Pi (chemiosmosis) |
Non-cyclic vs cyclic photophsophophorylation | The electrons from the chlorophyll a aren't passed onto NADP but are passed back to PSI via electron carriers |
Role of chlorophyll in photolysis | It is the lost electrons from photolysis that go to the chlorophyll after absorbing light Causes more water to dissociate |
How is energy of light converted into chemical energy in the LDR | Electrons excited Use of electrons carriers Production of ATP |
Calvin cycle | 6 CO2 (+ RuBisCO) ---> 12 GP (+12 ATP) ---> 1,3 biphosphate (+12 NADPH) ---> 12 TP ---> 10 TP (5 ATP) ---> 6 RuBP |