Exam3Review - Exam Three Review Chapter 10: Photosynthesis...

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Exam Three Review Chapter 10: Photosynthesis - Chloroplasts o Average plant cell has 10 to 100 o Found in the mesophyll (tissue in interior of leaf) o Take in O 2 through pores called stomata o Parts Double membrane Stroma: dense fluid (like cytoplasm) Thylakoids: little sacs Stacked in columns called grana Chlorophyll: green pigment in thylakoid membrane Thylakoid space: H + reservoir - Light o Visible: whatever color is reflected is seen o Chlorophyll Chlorophyll a: blue-green color (reflects this) Chlorophyll b: olive-green color (reflects this) Carotenoids: yellows and oranges (reflect these) Protect plants from sunburn o Photosystem Reaction-center complex surrounded by several light-harvesting complexes Provides more area and wider range to absorb max energy - Photosynthesis o Not just plants; cyanobacteria is a prokaryote that uses o 6 CO 2 + 12 H 2 O + light energy C 6 H 12 O 6 + 6 O 2 + 6 H 2 O Actually produces three-carbon sugar used to make glucose Water gets split CO 2 is reduced; H 2 O is oxidized o Light Cycle Location: thylakoid membrane Process o Water is split, provides H + and electrons, gives off O 2 o Add one H + and two electrons to NADP + for NADPH o Light energy adds P group to ADP for ATP Photosystem II
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Photon hits chlorophyll in light-harvesting complex, raising electron energy level energy is passed down a chain till reaches reaction center complex and pair of special chlorophyll molecules o electron transferred to primary electron receptor o enzyme splits H 2 O two electrons to replace those in special chlorophylls two hydrogen to the thylakoid lumen oxygen binds with oxygen and is given off as waste o electrons from receptor move down ETC to photosystem I provides energy for ATP synthesis Photosystem I o Light energy excites light-harvesting compounds, which excite reaction center complex to acceptor o Pass electrons to electron receptor, leaving chlorophyll pair ready to accept electron from photosystem II o Pass electrons down another ETC to protein called ferredoxin (Fd) No gradient produced here, so no ATP o Enzyme transfers electrons from Fd to NADP + Takes 2 electrons before going to Calvin cycle Takes H + from stroma Cyclic electron flow: alternative path using only photosystem I o Only produces ATP – releases at the intake of photosystem I rather than using to make NADPH Materials in H 2 O NADP + ADP Light energy
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This note was uploaded on 10/19/2011 for the course BSC 2010 taught by Professor Thomas during the Fall '07 term at University of Central Florida.

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Exam3Review - Exam Three Review Chapter 10: Photosynthesis...

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