Presentation on theme: "Energy Capturing Pathways I. Introduction A. History."— Presentation transcript:
Energy Capturing Pathways I. Introduction A. History
1. VanHelmont,1630, proved plants need 2. Priestly, 1772, proved plants need 3. Ingenhaus, 1779, proved plants need 4. DeSaussure, 1804, organized all the pieces 5. Van Neil, 1930, water gas (phlogiston) sunlight proved hydrogen in the glucose comes from splitting water
Non-cyclic Steps a. Light excites electrons of magnesium (oxidizes) of chlorophyll of photo-system II and I.I. b. Electrons from II are passed through an ETC to make ATP, while electrons from I are passed through an ETC to reduce NADP +. c. Electrons from II are used to backfill I chlorophyll that lost electrons to NADP +. d. Water is split by II to fill electrons lost to I by stealing electrons from hydrogen and provide a hydrogen to form NADPH.
Cyclic Steps a. Light excites electrons of magnesium (oxidizes) of chlorophyll of photo-system I only. b. Electrons from I are passed through an ETC to make ATP only. c. Electrons from I are used to backfill I magnesium of the original chlorophyll. d. Water is not split.
The ATP and NADPH chloroplast stroma used to energize CO 2 (ATP) & add hydrogen (NADPH) The O2 O2 to the stomata to be expelled or to mitochondria Do plants need to keep expelling O2 O2 for their benefit? Or yours?
a. Rubisco attaches 3CO 2 to RuBP b. Requires 6ATP and 6NADPH to make 6G3P c. Separate 1G3P and hold in reserve d. Rearrange other 5G3P back into RuBP requiring 3ATP e. Repeat as long as you have enough ???? 1Glucose requires18ATP +12NADPH