what happens in mitochondria
chemiosmosis
whats the 5 features of the mitochondria
1 - outer membrane
2 - intermembrane space
3 - inner membrane
4 - cristae
5 - matrix
what actually is the outer membrane
phospholipid bilayer
what does outer membrane contain?
transport proteins for ADP / ATP exchange
whats the function of outer membrane
selective permeability controls movement on mols in / out
what happens in the intermembrane space
high h+ concentration builds up here during oxidative phosphorylation
creating electrochemical gradient required for photosynthesis
what is a unique feature of iner membrane
highly folded - forms cristae
what does inner membrane contain
ETC
ATP synthetase
electron carriers
transport proteins
whats the cristae
folding of inner membrane
more cristae = increased surface area
whats the point of having more cristae
more ETC complexes more proton pumps more ATP synthase complexes enzymes
what is matrix site of
site of link reaction, krebs cycle
where is link reaction, krebs cycle
matrix
what actually is matrix
fluid filled central space
whats in the matrix
enzymes of link reaction + krebs
mitochondrial DNA
70s ribosomes
NAD/FAD
what are some adaptions of mitochondria
double membrane - compartmentalises respiration stages
cristae - max ATP production
matrix enzymes - ensures efficient krebs cycle
own DNA + ribosomes, mitochondria can synthesise own respiratory proteins quickly
6 steps of chemiosmosis
1 - inner membrane contains elctron carriers arranged in a chain
2 - NADH+FADH donate electrons and pass down ETC complexes
3 - energy released pumps H from matrix to intermmebrane space
4- creates proton gradient (high H+ outside, low inside)
5 - protons flow back into matrix via ATP synthetase
6 - drives oxidative phosphorylation - ADP+Pi=ATP
what donates electrons in chemiosmosis
NADH +FADH
how is proton gradient made in chemiosmosis
NADH + FADH donates electrons when passing down ETC
H pumped from matrix to intermembrane space
where is high where is low in chemiosmosis proton gradient
high H+ outside
low inside
