5.3 Link reactions and Krebs cycle Flashcards
Where do the link reaction and Krebs cycle take place?
The mitochondrial matrix
What happens to pyruvate in the link reaction?
Complete oxidation
Net gain of 1CO2 and 2H atoms per pyruvate
What kind of enzymes carry out decarboxylation?
Decarboxylase enzymes
What kind of enzymes carry out dehydrogenation
Dehydrogenase enzymes
What happens to the atoms of hydrogen that are removed?
Picked up by oxidised NAD to form reduced NAD
The NAD will take 2 hydrogen atoms to the inner mitochondrial membrane to produce ATP during OP
What happens to pyruvate in the krebs cycle?
Converted into acetylcoenzyme A with the help of NADH
What is the role of acetylcoenzyme A in the krebs cycle
Enters the cycle, reacts with oxaloacetate to form citrate and coenzyme A to be reused in the link reaction
What happens to citrate during the Krebs cycle
Converted back to oxoloacetate
What is removed from glucose in the krebs cycle and what does it form?
Carbon atoms to form carbon fragments, an acetyl group
What does the krebs cycle produce?
2 molecules of carbon dioxide
3 molecules of reduced NADH
one molecule ATP in substrate level phosphorylation
one molecules of reduced FAD
How is acetylcoenzyme A formed?
Acetate combines with coenzyme A (CoA)
