Transcription occurs in the nucleus in eukaryotic cells and at the nucleoid in prokaryotic cells.

Here's why:

* Eukaryotic cells have a well-defined nucleus where DNA is stored. Transcription, the process of copying DNA into RNA, takes place inside the nucleus.

* Prokaryotic cells lack a membrane-bound nucleus. Their DNA is located in a region called the nucleoid. Transcription happens directly within the nucleoid.

So, the location of transcription depends on the cell type: nucleus for eukaryotes, and nucleoid for prokaryotes.