Prokaryotes may be characterised by :
Absence of membrane surrounding organells
Prokaryotes (bacteria and archaea) lack a true nucleus; their circular DNA lies in an irregular region of the cytoplasm called the nucleoid, which has no nuclear envelope.
They also lack membrane-bound organelles such as mitochondria, chloroplasts, endoplasmic reticulum and Golgi bodies; their ribosomes are 70S and free in the cytoplasm.
A true nucleus is a eukaryotic feature, so a statement that lets either a nucleus or a nucleoid be present does not define prokaryotes; all prokaryotes contain DNA as their genetic material; and RNA is never enclosed by a membrane in these cells.
So the characteristic feature is that their organelles are not surrounded by membranes.
Hence, Absence of membrane surrounding organells.
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