BIO 114 Lecture 17: LECTURE 17 - STUDENT NOTES (1)
Document Summary
Green plants include: green algae, nonvascular plants, seedless vascular plants, gymnosperms (seed vascular plants, angiosperms (seed vascular plants) Green plant synapomorphies: chlorophyll b is the primary photo-synthetic pigment thylakoids are stacked in grana in chloroplasts. Photosynthetic pigments are found within chloroplasts (40-50 per cell), embedded in membranes called thylakoids. In most plants (over 85%), the biochemical reactions begin when co2 binds to 1,5- ribulose bisphosphate (rubp). The compound that results is unstable and immediately splits (hydrolysis) to form two molecules of 3-phosphoglycerate (pga), each with 3 carbons. Rubp carboxylase (rubisco), located on the outside of the thylakoid membranes, catalyses this reaction. Next, a phosphate group from atp is added to each molecule of pga, producing 1,3- diphosphoglycerate (dpga). Then, nadph is used to reduce dpga to the 3-carbon sugar glyceraldehyde-3- phosphate (g3p). G3p, not glucose, is the carbohydrate produced by this series of reactions. G3p is used to reform rubp (atp required).
