1. You are studying transcription in eukaryotic cells using radioactive uracil. You notice that that insome of those cells the radioactive labels stays localized in the nucleus. Which of the following explanations would explain your observation?

a Those cells are normal, uracil labels transcription and transcription occurs in the nucleus

b. The capping enzyme in those cells is non functional

c. The chromatin remodeling complex is not functional in these cells

d. The RNA polymerase in those cells is non functiona