Electron Transport Chain – Biochemistry – Flashcards
Unlock all answers in this set
Unlock answersquestion
What is the electron acceptor in the ETC?
answer
Oxygen
question
What is the electron donor in the ETC?
answer
FADH2 and NADH2
question
Where does the ETC occur in the cell?
answer
On the inner membrane of the mitochondria (the cristae)
question
True or false, the TCA cycle and the ETC are both oxidative phosphorylation.
answer
False, just the ETC.
question
Why can't hydrogen in fats and carbs spontaneously combine with Oxygen?
answer
Because they lack the activation energy and require enzymes to lower it.
question
True or false, oxidized substance has the lowest tendency to accept electrons?
answer
False, it has the greatest tendency to accept electrons.
question
What drives the synthesis of ATP in the oxidative phosphorylation?
answer
The downhill proton gradient running across the mitochondrial membrane.
question
How is the proton gradient formed?
answer
Electrons carried by reduced coenzymes (NADH and FADH2) pass through a chain of proteins releasing protons in the intercellular space.
question
How does ATP production in the ETC differ from ATP production in glycolysis?
answer
It uses chemiosmotic coupling.
question
Where does NADH go to in the ETC? Describe it.
answer
NADH goes to Complex I AKA NADH Dehydrogenase, or NADH Q-Reductase. This complex has FMN, which accepts 2 electrons from NADH and transfers them to CoQ. This complex is very rich in iron.
