Final answer:
The shared characteristic between prokaryotic and eukaryotic cells is the presence of ribosomes for protein synthesis.
Step-by-step explanation:
A characteristic shared by prokaryotes and eukaryotes is the presence of ribosomes for protein synthesis. Ribosomes are small structures present in all types of cells and are responsible for assembling amino acids into proteins.
The characteristic shared by both prokaryotic cells and eukaryotic cells is ribosomes for protein synthesis. Both cell types use ribosomes as the sites where proteins are assembled according to the genetic instructions coded in DNA. Unlike a true nucleus, which is only present in eukaryotes, or cell walls comprised of cellulose, which are found in some eukaryotes, ribosomes are a universal feature across all cellular life forms.