Why don't the prokaryotic cells have a nucleus?

Just to add to previous answers: Prokaryotes do have their genomic DNA concentrated and localized to a small area within the cell (nucleoid region). So it's not entirely accurate to say that prokaryotes don't have a nucleus. They do however lack a 'true' nucleus that is membrane bound. read more

Prokaryotes do have their genomic DNA concentrated and localized to a small area within the cell (nucleoid region). So it's not entirely accurate to say that prokaryotes don't have a nucleus. They do however lack a 'true' nucleus that is membrane bound. read more

And so, as you may have deduced, prokaryotic cells generally do not have a nucleus. Further Understanding In addition to not having a nucleus, prokaryotic cells do not have nuclear membranes or membrane-bound organelles, including mitochondria, endoplasmic reticula, or golgi apparati, among others. read more