krebs cycle Flashcards
what feeds into the krebs cycle from the link reaction
acetly COA
what then happens to acetly COA
coa is released
how is COA released
bond broken between acetyl COA and then recyceled back into the link reaction
what is formed after binding of actyle COA and oxelacetate
citrate
how is citrate formed
from acetly joining oxaloacetate compound
how many carbons are at oxaloacetate
4
how many carbons are at citrate
6
why are there 6 carbons at citrate
becuase the 4 carbon compound of oxaloacetate and the 2 carbon compound of acetyl join to form 6 carbon compound citrate
what forms after citrate
5 carbon compound
what forms after the 5 carbon compound
4 carbon compound
what does the fad become and why
FADH due to reduction
what happens to the fad added
it is reduced
when is FAD added
after the addition of adp on the 4 carbon compound
describe and explain the krebs cycle (5 marks)
-acetyl (2c) binds to oxoelactate (4c) forming citrate (6c)
- COA is released during the binding of acetyl to ozoloactate and is recylced back into krebs cycle
- citrate dcarboxylated
-citrate dehyrdroginated and NAD accepts H+ forming NADH
- 5c compund formed
-5c compound decarboxylated and dehydroginated
- 3x nad is reduced and accepts H+ ions to form 3x NADH
- FAD is oxidised to FADH
- substrate level phosporylation occours in conversion of ADP +Pi to ATP
- oxoloactytate is produced (4c)
- cycle repeates
- 2 turns of krebs cyle form one glucose molecule ( only goes round once for every molecule of pyruvate )
what is the net imput of the krebs cycle
3x NAD
ADP + Pi
FAD
