Bio 110, ch8
Bio 110, ch8 Bio 110
University of Louisiana at Lafayette
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This 2 page Class Notes was uploaded by Alexandra Notetaker on Thursday October 6, 2016. The Class Notes belongs to Bio 110 at University of Louisiana at Lafayette taught by Dr. Phyllis Griffard in Fall 2016. Since its upload, it has received 5 views. For similar materials see Fundamentals of Biology I in Biology at University of Louisiana at Lafayette.
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Date Created: 10/06/16
Ch 8 photosynthesis Photosynthesis: the line between the living and the dead The goal is to make glucose Photo autotrophs feed themselves and everything else on Earth CO 2 H O+2unlight -> C H O +6H12 6 O 2 2 Photosynthesis is an endergonic reaction o CO2 is reduced and water is reduced Electron transport happens in the thylakoids called light reactions o Thylakoids are inside of chloroplasts and are green from the reflection of green light in chlorophyll Light is electromagnetic waves (are also called photons) o Light hits the chlorophyll and either goes through, goes in, or reflects of o Green is reflected and all others are absorbed Chlorophyll A-> the main photosynthetic pigment Chlorophyll B-> broadens the spectrum used for photosynthesis Carotenoids->absorb excessive light that would normally damage chlorophyll o Non plant autotrophs use diferent pigments than these Absorption spectrum matches action spectrum o Pigments absorb some light and reflect others Red and blue and violet has highest absorbency Green is reflected o When a good color that chlorophyll likes hits it will enter and excite the electrons o Transmittance is when light goes straight through Light Reactions o In photosystem II light enters and bounces around until it hits and excites the p680 reaction center The reactant center complex is the only pigment oxidized during light capture Energy bounces around until it hits this special electron in the reaction center o The electron is boosted up to the primary electron acceptor where it is brought to the photosystem I o The process repeats except energy must excite the p700 reaction center o As electrons move across the transport chain, NADPH form carrying H+ o These H+ are used to make ATP at the end using ATP synthase o In cyclic phosphorylation, only ATP is made Photosystem II (680) > primary electron acceptor> photosystem I (700) >primary electron acceptor In the Calvin cycle NADPH and ATP is used as energy to make G3P o Rubisco (an enzyme) is used to transform RuBP into G3P using carbon fixation o Every two G3P make one glucose molecule Photo respiration decreases efficiency o Whenever plants are exposed to hot, dry conditions their stoma close trapping in O2 and prohibiting CO2 from coming in This makes O2 bind instead of CO2 o To combat this some plants have either added and extra step to photo synthesis (C4 plants) or have begun to photosynthesize at night (cam plants)
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