Please enable JavaScript.
Coggle requires JavaScript to display documents.
Ch10: Photosynthesis (Light reactions (Linear electron flow (B11CD2AC-1ADE…
Ch10: Photosynthesis
Light reactions
-
-
-
The amount of energy is inversely related to the wavelength of the light: The shorter the wavelength, the greater the energy of each photon of that light
-
-
Chlorophyll a: pigment, absorbs blue-violet and red
-
Carotenoids: accessory pigment, absorb violet & blue-green
Action spectrum: profiles the relative effectiveness of different wavelengths of radiation in driving photosynthesis
-
-
Reaction-center complex: proteins holding a special pair of chlorophyll a molecules and a primary electron acceptor
-
-
-
-
-
electron transport chain proteins in the thylakoid membrane of the chloroplast pump protons from the stroma into the thylakoid space (interior of the thylakoid), which functions as the
Light energy
-
Stomata: microscopic pores, co2 enters and o2 exits
Mesophyll: tissue on the inside of leaf, contains chloroplasts
-
Water transports through veins, exports sugar
mesophyll cell has about 30–40 chloroplasts, each measuring about 2–4 µm by 4–7 µm
-
-
-
Chlorophyll: green pigment within thylakoids, absorbs light energy
-
-
-
-
-
-
Other methods
Photorespiration: consumes light & O2, produces co2
-
photorespiration decreases photosynthetic output by siphoning organic material from the Calvin cycle and releasing co2
Bundle-sheath cell; a type of photosynthetic cell arranged into tightly packed sheaths around the veins of a leaf:
-
The mesophyll cells of CAM plants store the organic acids they make during the night in their vacuoles until morning, when the stomata close
enzymes in the chloroplast and cytosol convert the G3P made in the Calvin cycle to many other organic compounds
Plants stockpile extra sugar by synthesizing starch, storing some in the chloroplasts themselves and some in storage cells of roots, tubers, seeds, and fruits
Calvin cycle
the Calvin cycle is anabolic, building carbohydrates from smaller molecules and consuming energy
-
-
the electrons from NADPH reduce a carboxyl group on 1,3-bisphosphoglycerate to the aldehyde group of G3P, which stores more potential energy
the carbon skeletons of five molecules of G3P are rearranged by the last steps of the Calvin cycle into three molecules of RuBP
The G3P spun off from the Calvin cycle becomes the starting material for metabolic pathways that synthesize other organic compounds, including glucose/sucrose/etc
r
-
-
-
-