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26 Cards in this Set
- Front
- Back
Photosynthesis equation
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6CO2+6H2O->C6H12O6+6O2
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light reaction
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converts light energy into chemical energy: ATP and NADPH.
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light independent reactions
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do not use light directly. uses ATP and NADPH and CO2 to make carbs.
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photons
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particles with no mass
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light is a form of __________ radiation
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electromagnetic
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when photon mees molecule it either:
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bounces off, passes, or gets abosorbed.
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pigments
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molecules that absorb wavelength in visible spectrum.
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absoprtion spectrum
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what we see after plotting light absorbed by purified pigment against wavelength
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action spectrum
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plot of biological activity of organism as function of wavelengths of light to which it is exposed.
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steps to determining action spectrum.
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place a plant on a closed container, expose to light of certain wavelength, measure O2 released.repeat.
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three photosynthetic pigments used in plants:
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chlorophyll, carotenoids, phycobilins.
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which pigments absorb and drive light reactions?
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chlorophyll a and cholorophyll b
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describe their structure
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complex ring. magnesium in the middle. long hydrocarbon tail that anchors chlorophyll molecule to protein
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what color does chlorophyll absorb?
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blue and red.
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what color does carotenoids absorb?
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blue anb blue green
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what color does phycobilins absorb?
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yellow-green, yellow, organge.
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name three fates for absorbed energy:
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released as heat/light, rapidly transfered to next pigment molecule, can be used as free energy in chemical rxn.
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flourescene
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process in which energy is given off as heat and light.
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what's requirement to pass energy to another pigment molecule?
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target molecule must be near, must have right orientation, and must be approporaite structure to gain energy.
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antenna system
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In photosynthesis, a group of different molecule that co-operate to absorb light energy and transfer it to reaction center.
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photosystem
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light harvesting complex in chloroplast thylakoid composed of pigments and proteins.
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reaction center
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where received energy from light absorbing pigments and change to chemical energy.
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chlorophyll
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-absorbs light energy and transforms to excited electrons.
-transfers electrons to other molecules and initiates chemical changes. |
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electron transport
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downhill series of reductions and oxidation. produces NADPH.
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noncyclic electron transport
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produces NADPH and ATP. excited electron lost from chlorophyll so reduced coenzyme happens.
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cyclic electron transport
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produces ATP. the transport process ends up with excited electron returning to chlorophyl after giving up energy to make ATP.
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