(a(i))[2]
Explain what the following terms mean: decarboxylation; dehydrogenation.
(a(ii))[1]
Using the letters in the cycle, state the positions at which decarboxylation occurs.
(b(i))[1]
State how many reduced NAD molecules are formed in the Krebs cycle from one acetyl group that enters from acetyl CoA.
(b(ii))[5]
State the site where the reduced NAD molecules are re-oxidised and describe what happens to the hydrogen atoms.
(c)[4]
Describe the role that reduced NAD plays in respiring yeast cells when oxygen is absent.
(d)[3]
Describe how lactate production in muscle tissue differs from anaerobic respiration in yeast.
(ii)[5]
State the site where reduced NAD molecules are re-oxidised and describe the fate of the hydrogen atoms.