In chloroplasts, light drives the conversion of water to oxygen and NADP+ to NADPH with transfer of H+ ions across chloroplast membranes. In mitochondria, it is the conversion of oxygen to water, NADH to NAD+ and succinate to fumarate that generates a proton gradient. Although some bacteria have electron transport chains with components similar to those in chloroplasts or mitochondria, others use different electron donors and acceptors. Both the respiratory and photosynthetic electron transport chains are major sites of premature electron leakage to oxygen, generating superoxide and potentially resulting in increased oxidative stress.
|CLICK ON IMAGE TO ENLARGE VIEW. Source; http://giantshoulders.wordpress.com/2007/10/21/the-mitochondrion-pt-2-the-electron-transport-chain/|
HERE ARE OTHER VIDEOS:
THE FOLLOWING VIDEO IS A GREAT VIDEO TO REVIEW WHAT YOU KNOW NOW: WATCH THE VIDEO AND EXPLAIN IN YOUR OWN WORDS WHAT EXACTLY IS TAKING PLACE...GOOD LUCK :)