All UK Exam Boards included

Link reaction and Krebs cycle

Download Topic

The pyruvate proceeds to being oxidised to a compound called acetyl coenzyme A upon reaction with coenzyme A which results in the production of yet another NADH and, voila! a carbon dioxide molecule, our first ever CO2; please welcome it graciously…

 

So far we’ve got 2 ATP, 3 NADH and 1 CO2 – not that impressive, onwards and upwards!

 

P.S.: the pyruvate –> acetyl-CoA step isn’t part of glycolysis, (it’s called the link reaction) I just tagged it along to have 3 steps overall rather than 4. Magic numbers and all that.

 

2. The citric acid (Krebs) cycle

The previously produced acetyl-CoA gets oxidised to carbon dioxide, while NAD continues to be reduced to NADH. The CO2 gets eliminated when we exhale, while the NADH is passed onto the next and final step of aerobic respiration.

 

The Krebs cycle is a series of reduction-oxidation reactions (redox reactions) which produce multiple coenzymes. Coenzymes are molecules which assist enzymes in their catalysing activity.

 

 

 

 

 

Sorry! There are no posts.

Sorry! There are no posts.

Your Reviews

Thank you for making all the content btw!

Serena Kutty YouTube

OMG them videos are great! You're a goldmine - and I'm a gold digger ;)

sc12 YouTube

Hi! I have recently finished my first year doing biology at uni and I subscribed to you back when I was doing AQA A levels (glad I don’t live in Wales after watching this vid lol) and you and your website helped me so much. Just wanted to say it’s so nice to see you

Mr Peanutbutter YouTube

I’ve struggled so much with feeling overwhelmed with biology revision, and I don’t know where to start. But your website is just what I need! It tells me all the information I need, and the knowledge I need to then build on, and it’s written in a way that soaks straight up into my brain!

Prettyhetty The Student Room

Thank you!! Your site is so helpful!

studyaspect YouTube