All UK Exam Boards included

Oxidative Phosphorylation

Download Topic

3. Oxidative phosphorylation

The NADH harvested from the Krebs cycle is oxidised back to NAD. This produces a stream of free electrons because, remember, oxidation = loss of protons or electrons. These electrons progress through the electron transport chain from coenzyme to coenzyme, down an energy gradient. Eventually they must be accepted by a terminal electron acceptor. This is oxygen, and that is why O2 is needed in aerobic respiration. The product is water, H2O.

 

The abundant ATP molecules are produced when the electron transport chain creates a proton gradient across the mitochondrial inner membrane (cristae). Since the gradient drives the force of protons being transferred across to the side where there are less of them, ATP is produced when the protons go through special cross-membrane enzymes which use the energy derived from their passage to turn one ADP molecule into one ATP molecule. This is chemiosmosis.

 

 

 

 

 

 

Sorry! There are no posts.

Sorry! There are no posts.

Your Reviews

You're such a G. Helped me so much, finally found someone who breaks biology down into something I can understand!!!

Alex Contact Form

Thank you!! Your site is so helpful!

studyaspect YouTube

Good topic notes and cool videos. I'll definitely recommend it to my students.

Seema Sehgal AQA Examiner and biology teacher on LinkedIn

You explain everything so simply! 

SecretDuck The Student Room

Just a huge thank you for spending your time helping others. I love your site and I'm seriously very grateful. No word of a lie

Neuron13 The Student Room