Explain the link reaction that occurs between glycolysis and the Krebs cycle.

pyruvate (from glycolysis) enters a mitochondrion;
enzymes in the matrix remove one carbon dioxide and hydrogen from the pyruvate;
hydrogen is accepted by NAD/forms NADH;
removal of hydrogen is oxidation;
removal of carbon dioxide is decarboxylation;
the whole process/link reaction is oxidative decarboxylation;
the product is an acetyl group which reacts with CoA/coenzyme A;
acetyl CoA enters Krebs cycle;
Accept any of the above points in the form of a clearly drawn and correctly labelled diagram.

In C3 many candidates discussed the Krebs cycle, rather than the link reaction as required. Careful reading of the question is vital.