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16 Cards in this Set

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Autotrophs
organisms that produce their own food, photosynthesis
heterotrophs
organisms that must take in preformed organic molecules
absorption spectrum
pigments found in chlorophyll absorb various portions of visible light, percent of light absorbed at each wavelength
light reactions
only take place in the presence of light, energy-capturing reactions
Calvin cycle reactions
take place in the stroma, can occur in either the presence of absence of light,
photosystem
photosynthetic unit comprised of a pigment complex and an electron acceptor, solar energy is absorbed and high energy electrons are generated
noncyclic electron pathway
occurs in the thykaloid membranes and requires participation of two light-gathering units
cyclic electron pathway
PS1 antenna complex absorbs solar energy, electrons pass from a higher to a lower energy level,
chemiosmosis
electrons move carrier to carrier, giving up energy, ATP production is tied to a electrochemical (H) gradient
Calvin cycle reactions
series of reactions producing carbohydrates, follow light reactions,
Fixation of carbon dioxide
attachment to organic compound RuBP- five carbon molecule that combines with carbon dioxide
Reduction of carbon dioxide
3PG (3 phosphoglycerate) molecule forms, light dependent reactions provide NADPH and ATP to reduce 3PG to G3P
Regeneration of RuBP
uses ATP produced by light reactions, for every three turns of the Calvin cycle, five molecules of G3P are used to reform three molecules of RuBP
Photorespiration
oxygen is taken up and CO2 is produced, produces only one 3PG
C4 photosynthesis
plants- bundle sheath cells as well as the mesophyll cells contain chloroplasts, have advantage over C3 plants because photorespiration does not occur
CAM photosynthesis
plants form a C4 molecule at night when stomates can open without loss of water, desert plants, minimal due to the amount of CO2 fixed at night