5.1 Aerobic respiration Flashcards
What are the stages of aerobic respiration?
glycolysis (in cytoplasm)
link reaction
Krebs cycle
oxidative phosphorylation (in mitochondria)
What is cellular respiration?
it yields ATP as a source of energy for metabolic reactions, and the process generates heat
What happens in the link reaction?
- (3C) pyruvate crosses into mitochondria through mitochondrial membrane
- decarboxylation - co2 removed
- (2C) compound joins coenzyme A forming 2C acetyl coenzyme A
- at same time: pyruvate is oxidised - NADH formed for electron transport chain
What is the formula for the link reaction?
pyruvate (3C) + CoA + NAD —> acetyl CoA (2C) + CO2 + reduced NAD (NADH)
What are the stages of the Krebs cycle?
- acetyl CoA combines with 4C compound - forming 6C compound citrate
- co2 removed and NADH formed - leaving 5C acid
- co2, removed and 2 NADH, 1 FADH, 1 ATP formed - leaving 4C acid
4C acid combines with 2C acetyl CoA
Where does the electron transport chain take place?
inner mitochondrial membrane
What is chemiosmosis?
process that links the electrons that are passed down the electron transport chain and the production of ATP - movement of H+ ions along an electrochemical, pH, concentration gradients
How is ATP synthesised by chemiosmosis?
- H+ ions accumulate in the membrane space
- H+ move along electochemical, concentration, pH gradients through special pores
- H+ goes through ATPase, forming enough energy for phosphorylation
- ADP + P ——> ATP
Where does glycolysis take place?
cytoplasm
Where does the link reaction take place?
through mitochondrial membrane
Where does the Krebs cycle take place?
in the mitochondrial matrix
Where does oxidative phosphorylation take place?
inner membrane of mitochondria
Why are mitochondrial membranes important in oxidative phosphorylation?
membrane maintains proton gradient thats drives oxidative phosphorylation
