7.5 electron transport chain Flashcards
what is the electron transport chain?
energy from the electron carriers is released in a series of redox reactions that occur as electrons pass through a chain of protein complexes in the inner mitochondrial membrane to the final electron acceptor oxygen, which is then reduced into water. The energy is not directly made into ATP, instead the electrons are coupled to the transfer of protons across a charged gradient that provides a source of potential energy for the synthesis of ATP.
How are electrons transported along the electron transport chain?
through a series of 4 large protein complexes that are embedded in the mitochondrial inner membrane.
Where do electrons enter the electron transport chain?
either complex 1 (NADH) or 2 (FADH2) which are then transported to complex 3 then through complex 4.
When oxygen accepts electrons at the end of the electron transport chain.
it is reduced to water form
O2 + 4e- + 4H+ -> 2H2O
What occurs in the electron transport chain?
- Coenzyme Q is reduced to CoQH2 and transfers electrons from complexes 1 and 2 to complex 3
- cytochrome c moves to complex 4 where oxygen is reduced to form water.
- ATP synthase uses the electrochemical proton gradient to drive the synthesis of ATP
What is ATP synthase?
a molecular machine that is composed of two subunits F0 and F1
What occurs during ATP synthase
- the F0 subunit forms a channel that rotates as protons pass through it.
- The F1 subunit then uses this rotational energy to catalyze the synthesis of ATP from ADP and Pi.
Why to proteins go down concentration gradient?
to make ATP through ATP synthase
How many molecules of ATP are produced from NADH and FADH2?
NADH- 2.5
FADH2- 1.5
what is the overall ATP production for the oxidation of glucose?
32 ATP
What is the approximate total ATP yield for cellular respiration?
substrate level phosphorylation- 4ATP
oxidative Phosphorylation- 28 ATP
