Respiration Flashcards
what are the 4 stages involved in aerobic respiration?
glycolysis
links reaction
krebs cycle
oxidative phosphorylation
where does glycolysis take place?
in the cytoplasm
what happens during glycolysis?
glucose is phosphorylated by 2 molecules. 2 molecules of phosphate from ATP are added to glucose. This forms glucose phosphate.
glucose phosphate is split into 2 molecules of triose phosphate (3C).
triose phosphate is oxidised. H is transferred to NAD forming NADH.
when triose phosphate is oxidised, it becomes pyruvate (3C).
what happens during glycolysis?
glucose is phosphorylated by 2 molecules. 2 molecules of phosphate from ATP are added to glucose. This forms glucose phosphate.
glucose phosphate is split into 2 molecules of triose phosphate (3C).
triose phosphate is oxidised. H is transferred to NAD forming NADH.
when triose phosphate is oxidised, it becomes pyruvate (3C).
what are the products of glycolysis?
net gain of 2 ATP
2 pyruvate
2 NADH
where does the links reaction take place?
in the matrix of the mitochondria.
what happens in the links reaction?
pyruvate (3c) is oxidised to form acetate.
H molecules that were removed are accepted by NAD, forming 2 molecules of NADH.
At the same time, pyruvate is decarboxylated - a CO2 molecule is removed leaving a 2C molecule.
2C acetate molecule is combined with CoA to form acetylCoA.
what is produced during the links reaction?
2 acetyl CoA
2 CO2
2 reduced NAD.
where does the Krebs cycle happen?
in the matrix of the mitochondria.
what is the rhyme that helps to remember the Krebs cycle?
C, NA. C, NA, A, FA, NA
what happens during the first stage of the Krebs cycle?
AcetylCoA from links reaction combines with oxaloacetate to form citrate.
CoA goes back to the links reaction to be used again.
What happens during the second stage of the Krebs cycle?
the 6C citrate compound is converted to a 5C compound.
Decarboxylation and dehydrogenation both occur.
H is accepted by NAD and produces NADH.
what happens during the third stage of the Krebs cycle?
the 5C molecule is converted to a 4C molecule.
Decarboxylation and dehydrogenation occuring producing 1 FADH and 2 NADH.
ATP is produced during substrate-level phosphorylation.
Citrate has now been converted to oxaloacetate.
