Which of the following distinguishes this bacterial cell from eukaryotes?

The correct option that distinguishes a bacterial cell from eukaryotes is:

**D. DNA in the bacterial cell is always in contact with the cytoplasm, and all eukaryotes have DNA located inside a nucleus.**

This statement accurately reflects a key difference between prokaryotic (bacterial) cells and eukaryotic cells. In bacteria, DNA is found in a region called the nucleoid, which is not membrane-bound, allowing it to be in direct contact with the cytoplasm. In contrast, eukaryotic cells have their DNA contained within a membrane-bound nucleus.

Let's briefly evaluate the other options:

A. Incorrect. Both bacterial cells and eukaryotic cells can have a cell membrane, and many eukaryotic cells also have a cell wall (e.g., in plants and fungi).

B. Incorrect. While many eukaryotes are multicellular, some eukaryotes are unicellular (e.g., protists, yeast).

C. Incorrect. Both bacterial cells and eukaryotic cells have ribosomes; however, they are different in size and structure.