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36 Cards in this Set
- Front
- Back
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Where does photosythesis take place?
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chloroplast
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Where is drama Act I performed of photosynthesis?
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thylakoid membrane inside each disk
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What happens in the thylakoid membrane?
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light energy is captured by electrons of chlorophyll molecules
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What happens to the excited electrons?
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they are passed along a series of acceptors in an electron transport chain
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What do the protons do that were pumped out of the thylakoid membrane?
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drive the production of ATP
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What do excited electrons do?
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they reduce NADP+ to NADH
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What is the energy used for that is stored in NADH?
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It is used in Act II for the biosythesis of glucose-- this takes place in the dark of the stroma-outside of the thylakoid membrane
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With what is CO2 from the atmosphere combined?
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a five carbon sugar
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The light energy involved with photosynthesis drives the reduction of carbon essentially in what direction?
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the reverse direction of oxidative carbohydrate metabolism
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Where do light reactions take place?
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thylakoid
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Where do dark reactions take place?
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stroma
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Where do primary reactions of photosynthesis occur?
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photosynthetic reaction center (PRC)
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What do chlorophyll molecules in the reaction center do?
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gather light- act as light harvesting antennas
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What do the antenna chlorophylls do with the energy of the absorbed photons?
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they pass the units of light from molecule to molecule until it reaches a PRC
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What can sometimes happen with the energy of an absorbed photon?
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it can be re-emitted in the form of fluorescence
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Are there different types of chlorophyll?
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yes
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What type of ring do all chlorophylls have?
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tetrapyrrole ring similar to that of porphryins of heme
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Do chorophylls absorb different wavelengths of light?
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yes
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What are the accessory light absorbing pigments?
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carotenoids
phycoerythrin phycocyanin |
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What type of element does chlorophyl have in its center?
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Mg
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Does heme or chlorophyll have an extra ring?
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chlorophyll
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Do light-harvesting complexes contain multiple pigments?
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yes
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What are most of the light-harvesting complexes?
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antenna pigments
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What is the time for energy transer to the reaction center?
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<10^-10
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Accessory pigments
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"fill in" regions of the absorption not covered by chlorophylls
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In deeper water (10 m), light outside of wavelengths 450-550 nm is completely absorbed so what do algae and cyanobacteria replace chlorophyll a with?
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phycoerythrin and phycocyanin
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How many processes are part of photosynthesis?
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two
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What do the light reactions consist of?
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electron transfer, where water is oxidized to produce oxygen and NADP+ is reduced to produce NADPH
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What do the light reactions consist of?
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electron transfer where carbon dioxide is reduced to carbohydrates
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How many parts can we consider electrons in the light reaction to have?
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three
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What is the first part of the trip the electron takes?
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transfer electrons from water to the reaction-center chlorophyllof PSII
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What is the second part of the trip the electron takes?
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the transfer of the electrons from the excited state chlorophyll of PSII to an electron-transport chain consisting of accessory pigments and cytochromes, with energy provided by absorption of a photon of light
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What is the third part of the trip the electron takes?
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moving of electrons from the excited-state chlorophyll of PSI to the ultimate electron acceptor NADP+, producing NADPH (again using energy provided by light)
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The absorption of one photon does what?
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promotes electron from ground state to excited state
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What does the energy difference have to match?
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energy difference between two states has to match the energy of the photon
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Excitation transfer
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resonance energy transfer
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