IB Biology HL 1.2.12 Krebs cycle Question Bank

Krebs cycle only occurs in aerobic conditions; the Krebs cycle occurs in the mitochondria; acetyl CoA from the link reaction releases an acetyl group; $\mathrm{NADH}+\mathrm{H}^{+}$and $\mathrm{CO}_{2}$ are formed (with each decarboxylation); decarboxylation/removal of $\mathrm{CO}_{2}$ involves oxidation/oxidative decarboxylation; and the release of energy; acetyl group is joined to a 4-carbon molecule/ $\mathrm{C}_{4} /$ oxaloacetate to form a 6-carbon molecule/citrate;
(decarboxylation changes citrate) to 5-carbon molecule/ $\mathrm{C}_{5}$; (decarboxylation changes glutamate) to a 4-carbon molecule/ $\mathrm{C}_{4}$; then converted into the original 4-carbon molecule/ $\mathrm{C}_{4} /$ oxaloacetate and the cycle repeats;
one (molecule) of ATP is made during this step; reduced H-carriers/ NADH and FADH2 and carbon dioxide are end-products of Krebs cycle;