What are the similarities between prokaryotes and eukaryotes?

Despite their many differences, prokaryotes and eukaryotes have a few features in common. Both prokaryotes and eukaryotes have these features in common: 

• Cell membrane 
• Cytoplasm
• DNA as the genetic material – in prokaryotes it is circular and dispersed in the cell, whereas in eukaryotes it is linear and secured in the nucleus.
• Ribosomes – prokaryotes have smaller 70s ribosomes, whereas eukaryotes have larger 80s ribosomes.
• Similar basic metabolism