Question

eukaryotic pre - mrna molecules are modified multiple choice at the transcription bubble. at the ribosome. inside the nucleus. as they pass through the nuclear membrane. in the cytoplasm.

Explanation:

Eukaryotic pre - mRNA undergoes modifications like capping, poly - adenylation and splicing. These processes occur in the nucleus before the pre - mRNA is transported to the cytoplasm for translation. The transcription bubble is the site of transcription, the ribosome is for translation, and the nuclear membrane is just a boundary for transport. So pre - mRNA modifications happen inside the nucleus.

Answer:

C. inside the nucleus.