Lecture 22: Photophosphorylation Flashcards
what does the light dependent reactions in thylakoid membranes do
it transfers electrons from H2O to NADPH
what is photophosphorylation
makes ATP during photosynthesis
what is photophosphorylation similar to
similar to oxidative phosphorylation (aerobic respiration)
similarities between photophosphorylation and oxidative phosphorylation
energy source - light from sun: sugar in mitochondria
electron source - H2O:NADH
direction of proton accumulation: into thylakoid space of chloroplast: outside matrix of mitochondria
movement of protons - out of thylakoid space: into mitochondrial matrix
product of Linear electron transport (PS2-Cyt-PS1)
ATP and NADPH
what is the direction of cyclic electron transport
Electrons flow from PS1 to Cyt b6f
product of cyclic electron transport (PS1-Cyt)
ATP (no NADPH)
purpose of cyclic electron transport
regulatory mechanism to control stromal ATP/NADPH ratio
maintenance of metabolic activities in plants
what step does the water-water cycle not do to prevent production of NADPH
it does not go to ferridoxise
what is the product of the water -water cycle
ATP (no NADPH)
pathways of electron transport
Linear electron transport
Cyclic electron transport
water-water cycle
what are the phases/cycles that ATP synthase go through
O=open
T=tight
L=loose
what is the number of the enzyme complex ATP synthase
400kD
what does excess excitation energy lead to
photo-oxidative damage
photoexcitation outcomes
- heat
- fluorescence
- energy transfer
- photochemistry
