A dish of animal cells was grown in the presence of radioactive phosphorous. The phosphorous largely ended up in nucleotides inside the actively growing animal cells. In which cellular structure or structures would you predict the majority of the radioactive phosphorous to accumulate?

• A. Rough endoplasmic reticulum
• B. The Golgi apparatus
• C. Rough endoplasmic reticulum and Golgi apparatus
• D. The Golgi apparatus and the nucleus
• E. The nucleus