Question

compare and contrast the respiratory-ETS and photosynthesis-ETS with respect to energy flow and energy extraction

Answer 1

Both respiratory-ETS and photosynthesis-ETS posses cytochrome. Respiratory-ETS contains complexes (Complex I, II, III and IV), whereas photosystem-ETS contains photosystems (photosystem I and Photosystem II). In photosynthesis-ETS electrons are transfered from PSII to pheophytin, plastoquinone, cytochrome b6 complex, plastocyanin, PSI, phylloquinone, Iron sulfur protein, ferrodoxin, flavoprotein and finally to NADP reductase complex, whereas in respiratory-ETS electrons are tranfered from complex-I to complex-II, then to complex-III and complex-IV.

Respiratory-ETS

2H+ 2H+ H+ Cyt Cvt b FMN Cyt Cvtochrome C oxidoreductase complex NADH Dehvdrogenase Cvtochrome C oxidase Succinate Dehydrogenase complex complex ATPase complex Cvt c Cyta3 Complex-IV 3 ATP Complex-1 Complex-11 Complex-III

PS-I Photosynthesis Electron transport chain Phylloquinone PS-II Iron Sulfur protein Pheophytin Ferrodoxin Plastoquinone Cytochrome b6 complex Flavo protein e- Plastocyanin NADP+REDUCTASE COMPLEX PS-I NADPH+H+ e- PS-II H20- 2H +1/2 O2 ATP