Answer the following question given this paragraph: 

Besides the four parts listed above, many cells also have a nucleus. The nucleus of a cell is a structure enclosed by a membrane that contains most of the cell’s DNA. Cells are classified in two major groups based on whether or not they have a nucleus. The two groups are prokaryotic cells and eukaryotic cells.


Q: What structure of a cell is enclosed by a membrane and contains most of the cell’s dna?

 Choices:

- vacuole

- ribosome

- epidermis

- nucleus

A:
nucleus
