Please answer these questions 1 and 2 with some explanation,

Question 1 3 pts If you fed E. coli glucose that had 13C (heavy isotope of carbon) labeling at the C3 position of glucose (the aldehyde of glucose is the C1 carbon), the 13C would end up on which carbon(s) of pyruvate? The methyl group of one of the two pyruvate molecules The methyl group of both pyruvate molecules The carboxylates for both pyruvate molecules The middle carbon of both pyruvate molecules O The carboxylate of one of the two pyruvate molecules The middle carbon of one of the pyruvate molecules
Question 2 3 pts If you fed E. coli oxaloacetate that had 13C (heavy isotope of carbon) labeling at the carbonyl position (not at either of the carboxylates), the 13C would end up on what carbon(s) of glucose? O The C1 or C6 of glucose The C3 or C4 of glucose O The C2 or C5 of glucose O The C2 or C4 of glucose