Correct option is B
The correct answer is absence of nuclear membrane.
Organisms that lack a membrane-bound nucleus are called prokaryotes.
· A prokaryotic cell does not contain a well-defined nucleus.
· All prokaryotes have a cell wall surrounding the cell membrane except in mycoplasma.
Information Booster
· The nucleolus is absent in prokaryotic cells.
· The fluid matrix filling the prokaryotic cell is the cytoplasm.
· Membrane-bound cell organelles are absent in prokaryotes.
· In prokaryotes, cell division takes place by fission or budding.
· Blue-green algae, bacteria, and mycoplasma are examples of prokaryotes.
Additional Information
· Organisms that have membrane-bound nuclei are called eukaryotes.
· In eukaryotes, cell division takes place by mitosis or meiosis.
· All living organisms are made up of cells.
· Cell is the basic structure and functional unit of life.