BCHE 341: Coupling Redox Reactions

• Writer I am attaching a sheet that I need assistance with. I need you to help me with this sheet and show me step by step with how you came to you answer.
• I will attach the PowerPoint notes from class that goes along with this sheet on Coupling Redox Reactions.
• On the worksheet, you must create your own Redox reaction using two of the half-reactions in the table given on the worksheet.

In your steps:

20. Make sure to label and note which half reactions from the table 20.1 on the worksheet you will be coupling together to create your reaction.
21. Determine and label the half reaction that is the electron donor and which reaction will be the electron acceptor.
22. Determine and write if your reaction is endogenic (meaning favors substrate formation) or exergonic (meaning favors product formation).
23. Show and label all your work step by step so the professor can see.
24. I will also send over a copy of what one of my classmates did for their Coupling Redox reaction. Please review the sheet.

 

Biochemistry: A Short Course

Fourth Edition

CHAPTER 20: pp. 399-417

The Electron-Transport

Chain

 

19.3 Stage Two Regenerates Oxaloacetate and Harvests

Energy-Rich Electrons

• CAC produces high-transfer-potential electrons, a

nucleotide triphosphate (GTP) and CO2

• NET RXN:
• Electrons from NADH will generate 2.5 ATP when used to

reduce oxygen in the electron-transport chain

• Electrons from FADH2 will power synthesis of 1.5 ATP

with the reduction of oxygen in the electron-transport

chain

The Electron-Transport Chain

• Oxidative phosphorylation captures energy of highenergy

electrons to synthesize ATP

• Flow of electrons from NADH and FADH2 (recycling!) to

O2 occurs in the Electron-Transport Chain (ETC) or

respiratory chain

• Exergonic set of RedOx reactions generates a proton

gradient

• Proton gradient àpowers synthesis of ATP
• Cellular Respiration/Respiration: Citric acid cycle and

oxidative phosphorylation

20.1 Oxidative Phosphorylation in Eukaryotes

Takes Place in Mitochondria

• Electron-transport chain and ATP

synthesis occur in the

mitochondria

• Citric acid cycle also occurs in

mitochondrial matrix

– (e- gathering)

• Mitochondrial structure:

Mitochondria are bounded by a

double membrane