<P> A prokaryote is a unicellular organism that lacks a membrane - bound nucleus , mitochondria , or any other membrane - bound organelle . The word prokaryote comes from the Greek πρό ( pro ) `` before '' and κάρυον ( karyon ) `` nut or kernel '' . Prokaryotes are divided into two domains , Archaea and Bacteria . In contrast , species with nuclei and organelles are placed in the third domain , Eukaryota. . Prokaryotes reproduce without fusion of gametes . The first living organisms are thought to have been prokaryotes . </P>
<P> A prokaryote is a unicellular organism that lacks a membrane - bound nucleus , mitochondria , or any other membrane - bound organelle . The word prokaryote comes from the Greek πρό ( pro ) `` before '' and κάρυον ( karyon ) `` nut or kernel '' . Prokaryotes are divided into two domains , Archaea and Bacteria . In contrast , species with nuclei and organelles are placed in the third domain , Eukaryota. . Prokaryotes reproduce without fusion of gametes . The first living organisms are thought to have been prokaryotes . </P>
what does the prefix pro mean in prokaryotic
what does the prefix pro mean in prokaryotic
before
before