Electon Transport Chain Flashcards
What is the purpose of the ETC?
To make ATP through oxidative phosphorylation
5 major components of the ETC
NADH dehydrogenase Succinate dehydrogenase Cytochrome BC1 complex Cytochrome oxidase Oxygen
What are the two mobile electron carriers?
Ubuiquinone (UQ) Cytochrome C (cyt. C) Carry electrons between proteins in the inner mitochondrial membrane
Chemiosmosis
(Protein pump)
Production of ATP in cellular respiration occurs through Chemiosmosis. The movement of ions from high concentration to low concentration through membrane protein. This results in the release of H+
Where is the ETC?
Found in mitochondrial membrane
How are the proteins in the electron transport chain step up?
Set up in order of increasing electro negativity
first component weak electron acceptor
Step 1. Of the electron transport chain
NADH binds to NADH dehydrogenase
FADH2 binds to succinate dehydrogenase
Proteins are pumped into inter membrane space
Step 2. Of the electron transport chain
UQ carries electrons from NADH dehydrogenase to cytochrome B-C1
Cyt. C carries electrons from cytochrome B-C1 to cytochrome oxidase
Step 3. Of the electron transport chain
FADH2 starts at succinate dehydrogenase
It passes through fewer electron carriers making less ATP
-one molecule of NADH produces 3ATP and 3 H+
-one molecule of FADH2 produces 2 ATP and 2 H+
Step 4. Of the electron transport chain
When the 2 electrons leave cytochrome oxidase they combined with oxygen and hydrogen to produce water
Overall goal of electron transport chain
To create an electrochemical gradient to power ATP synthesis
Chemiosmosis after the electrochemical gradient has been made
H+ ions now forced through enzyme called ATP synthase embedded in the inner membrane
H+ flow from intermembrane space into the matrix
The flow of H+ protons provides energy to make a bond between ADP and Pi
