Session 3

Front 1

Autotrophs

Back 1

organisms that produce their own food, photosynthesis

Front 2

heterotrophs

Back 2

organisms that must take in preformed organic molecules

Front 3

absorption spectrum

Back 3

pigments found in chlorophyll absorb various portions of visible light, percent of light absorbed at each wavelength

Front 4

light reactions

Back 4

only take place in the presence of light, energy-capturing reactions

Front 5

Calvin cycle reactions

Back 5

take place in the stroma, can occur in either the presence of absence of light,

Front 6

photosystem

Back 6

photosynthetic unit comprised of a pigment complex and an electron acceptor, solar energy is absorbed and high energy electrons are generated

Front 7

noncyclic electron pathway

Back 7

occurs in the thykaloid membranes and requires participation of two light-gathering units

Front 8

cyclic electron pathway

Back 8

PS1 antenna complex absorbs solar energy, electrons pass from a higher to a lower energy level,

Front 9

chemiosmosis

Back 9

electrons move carrier to carrier, giving up energy, ATP production is tied to a electrochemical (H) gradient

Front 10

Calvin cycle reactions

Back 10

series of reactions producing carbohydrates, follow light reactions,

Front 11

Fixation of carbon dioxide

Back 11

attachment to organic compound RuBP- five carbon molecule that combines with carbon dioxide

Front 12

Reduction of carbon dioxide

Back 12

3PG (3 phosphoglycerate) molecule forms, light dependent reactions provide NADPH and ATP to reduce 3PG to G3P

Front 13

Regeneration of RuBP

Back 13

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

Front 14

Photorespiration

Back 14

oxygen is taken up and CO2 is produced, produces only one 3PG

Front 15

C4 photosynthesis

Back 15

plants- bundle sheath cells as well as the mesophyll cells contain chloroplasts, have advantage over C3 plants because photorespiration does not occur

Front 16

CAM photosynthesis

Back 16

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