BIOA02H3 Lecture Notes - Lecture 5: Malic Acid, Light-Independent Reactions, Carboxylation

• School: UTSC
• Department: Biological Sciences
• Course: BIOA02H3
• Professor: Ivana Stehlik

Document Summary

Introduction: c3 photosynthesis, c4 photosynthesis, cam photosynthesis, overview. Photosynthesis: with parenchyma containing chloroplasts also known as chlorenchyma. Photosynthesis transcription compromise: for ps, plants need to open stomata access to co2. >90%vof xylem h2o; lost to transpiration: problem if h2o cannot be replaced from soil (heat, drought) Photosynthesis and water use efficiency: goal: more sugar per transpired water, c3 < c4 < cam. Photosynthesis: when rubisco fixes o2, not co2. Loses c as co2; costs atp: only occurs in light and increase with increase temperature, occurs in up to 40% of reactions at today"s atmospheric (co2) Respiration: sugar + o2 = co2 + h2o + energy. ^ = burning of sugar for energy used anywhere necessary in normal metabolism and growth. C3 photosynthesis: most flowering plants (85%, c3: from 3-c 3-phosphoglycerate molecule in calvin cycle, effective under moist and not too hot conditions.