1) If this guanosine was isotopically labeled at the 4 positions shown, draw the purine degradation products that receive those labels. Be sure that your answer shows where the 4 labels go! (use asterisks, which can be typed away from the structure using the "A" tool and moved around): HO HO PO 2) If CMP was isotope-labeled at the 4 positions shown, draw the pyrimidine degradation products that receive these labels. Be sure that your answer shows where each of the 4 labels go! (use asterisks). N OH NH NH OH NH 3) If all C, N, and O atoms in glutamine where isotopically labeled, draw the structure of UMP that includes any incorporated labels (use asterisks) from that glutamine. Hint, it probably won't be all the labels. This question will be easier after you get through pyrimidine biosynthesis in the book and in lecture.