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photophotophun - 5 10.2 10.3(188 excitation of-195 Read...

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5) 10.2, 10.3 (188 excitation of… -195) Read “photosynthesis/light reaction (4B)” pg 25-27, Lab Guide DO LabBench 4, on campbellbiology.com Print quiz, bring for stamp. A. Discuss the reaction of a photosynthetic pigment to absorption of a photon of light. Explain why different pigments appear to be of different colors. B. Describe the production of NADPH (NADPre) and ATP by the light reactions. photosystems I and II , P700 and P680, cyclic and noncyclic photophosphorylation C. Compare and contrast electron transport in photosynthesis with electron transport in cellular respiration. A) Pigment - substance that absorbs light of specific wavelengths. -There are 3 photosynthetic pigments that broaden the spectrum absorbed during light reactions part of photosynthesis. -Chlorophyll a -absorbs violet-blue and red lights -Transmits green light. -Chlorophyll b -b is almost identical to chlorophyll a, but has a slightly different absorption spectra. -chlorphyll b transmits yellow green light. -Carotenoids -hydrocarbons that absorb violet and blue-green light and transmit shades of yellow and orange. -Also function in absorbing and dissipating excessive light energy that would damage chlorophyll or interact with oxygen making dangerous molecules. -Colors that correlate with absorption wavelengths disappear, and the ones that are not absorbed are reflected.
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