Question
Biology Question on Cell: the unit of life
Which of the following structures is not found in a prokaryotic cell?
A
Mesosome
B
Plasma membrane
C
Nuclear envelope
D
Ribosome
Answer
Nuclear envelope
Explanation
Solution
A prokaryotic cell is characterised by absence of an organised nucleus and membrane bound cell organelles. DNA is naked i.e., without a nuclear envelope and lies variously coiled in the cytoplasm. It is commonly called nucleoid or genophore. Mesosomes, plasma membrane and 70S ribosomes are present in a prokaryotic cell.