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16 Cards in this Set
- Front
- Back
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Wavelength |
The distance between crests if wave, such as those of the electromagnetic spectrum. |
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Electromagnetic Spectrum |
The entire spectrum of radiation ranging in wavelength from less than a nanometer to more than a kilometer. |
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Spectrophotometer |
An instrument that measures the proportions of light. |
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Absorption Spectrum |
The range of a pigment's ability to absorb various wavelengths of light. |
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Chlorophyll a |
A type of blue-green photosynthetc pigment that participates directly in the light reactions. |
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Chlorophyll b |
A type of yellow-green accessory photosynthetic pigment that transfers energy to chlorophyll a. |
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Carotenoid |
An accessory pigment, either yellow or orange, in the chloroplasts of plants; by absorbing wavelengths of light that chlorophyll cannot, they broaden the spectrum of colors that can drive photosynthesis. |
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Action Spectrum |
A graph that depicts the relative effectiveness of different wavelengths of radiation in driving a particular process. |
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Photosystem |
Light-capturing unit located in the thylakoid membrane of the chloroplast, consisting of a reaction center surrounded by numerous light-harvesting complexes. |
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Photosystem II |
One of two light-capturing units in a chloroplast's thylakoid membrane; it has two molecules of P680 chlorophyll a at its reaction center. |
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Photosystem I |
One of two light-capturing units in a chloroplast's thylakoid membrane; it has two molecules of P700 chlorophyll a at its reaction center. |
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Primary Electron Acceptor |
A specialized molecule sharing the reaction center with the pair of reaction-center chlorophyll a molecules; it accepts an electron from one of these two chlorophylls. |
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Reaction Center |
Complex of proteins associated with two special chlorophyll a molecules and a primary electron acceptor. Located centrally in a photosystem, this complex triggers the light reactions of photosynthesis. Excited by light energy, one of the chlorophylls donates an electron to the primary electron acceptor, which passes an electron transport chain. |
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Light-Harvesting Complex |
Complex of proteins associated with pigment (including chlorophyll a, chlorophyll b, and carotenoids) that captures light energy and transfers it to reaction-center pigments in a photosystem. |
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Noncyclic Electron Flow |
A route of light flow during the light reactions of photosynthesis that involves both photosystems and produces ATP, NADPH, and oxygen. The net electron flow is from water to NADP+. |
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Cyclic Electron Flow |
A route of electron flow during the light reactions of photosynthesis that involves only Photosystem I and that produces ATP but not NADPH or oxygen. |
