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26 Cards in this Set
- Front
- Back
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Where does chloroplasts come from? |
endosymbiotic event of cyanobacteria |
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What are the membranes of chloroplast |
Outer Inner Thylakoid |
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Where does the light dependent rxn occur |
Thylakoid membrane |
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How to measure photosynthesis? |
By measuring the evolution of O2 |
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What is photoreceptor? |
Photopigment; pigment that undergoes change upon absorbing a particular wavelength of length |
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What kind of structure does photoreceptor have |
Polyene structure |
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What is the principal photoreceptor |
Chlorophyll a |
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In what wavelength does chlorophyll a absorb light best |
430 nm and 664 nm |
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What are the other light absorbing chemicals |
beta carotene, lutein, phycoerythrobilin |
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What is photoinduced charge separation |
transfer of excited electron to a suitable nearby mol. whose excited state is equal/lower energy |
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Describe photosynthetic bacteria
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Has one photosystem
Charge separation occurs at rxn center No O2 or NADPH produced |
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What are the light-absorbing chemicals in bacteria? |
Bacteriochlorophyll b and Bacteriopheophytin |
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What is the maximum absorption of bacteriochlorophyll |
960 nm |
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What is the main difference between bacteriochlorophyll and bacteriopheophytin |
BChl-b is Mg-dependent and Bph has 2 protons |
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What is the similarity of bacterial and plant photoreaction center |
Require light to activate e- Use "special pair" of photoreceptors to absorb light Make use of ETC Generate proton gradient across membrane |
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What is the difference between bacterial and plant photosynthesis |
In plant, the system is not cyclic The photoreceptors are different Different e- carriers |
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What does photosystem 2 do in plants? |
Takes water from thylakoid lumen and make oxygen |
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Where does water donate e- in photosystem 2? |
Mn center |
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Why Mn is the ideal atom for the center |
Can exist in multiple oxidation state Form strong bonds with oxygen-containing species |
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What is the immediate e- donor in photosystem 2? |
Tyrosine |
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What does cytochrome bf complex do? |
Catalyze 2- transfer
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What are the components of cytochrome bf complex? |
4 subunits and 2 Hemes |
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What does plastocyanin do |
Shuttle e- from cyt bf to PS1 through thylakoid lumen |
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What does photosystem 1 do |
Produce reducing equivalents for calvin cycle |
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What does resonance energy transfer do? |
Helps energy move to special pair; makes use of accessory pigments by funneling the energy |
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How does ATP gets generated in chloroplast? |
Through chloroplast ATP synthase |
