A prokaryotic cell do not have a nucleus what do they have in this place
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.
Having no true nucleus has its own advantages. Prokaryotes can take in genetic material (plasmids, etc) from their surroundings and become protein manufacturing factories from whatever genetic code is put into them, provided the raw material (amino acids) is available. This can be seen as the ability to 'borrow information' from other successful organisms to survive in a particular environment. This however also makes the prokaryote more susceptible to viral infections, because the transcriptional and translational machinery is naked and easily accessible to the virus.
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In prokaryotic cell we do not have nucleus rather it has a nucleoid which works a bit similar to nucleus