True or False: All cells have a nucleus.

The statement that all cells have a nucleus is false. While it is true that many cells within multicellular organisms, such as plant and animal cells, do possess a nucleus where the genetic material is housed, there are significant exceptions to this rule. Prokaryotic cells, such as bacteria and archaea, do not have a nucleus. Instead, their genetic material is found in a region called the nucleoid, which is not membrane-bound. Therefore, the presence of a nucleus is dependent on the type of organism and the specific cell category, making it incorrect to state that all cells have a nucleus.

This understanding highlights the diversity of cell types and their structures, reflecting the complexities of life at a microscopic level. It also underscores the distinction between prokaryotic and eukaryotic cells, which is an essential concept in biology and related fields.