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Solution


Q.

Which of the following structures is not found in a prokaryotic cell                      [2015]
1 Mesosome  
2 Plasma membrane  
3 Nuclear envelope  
4 Ribosome  

Ans.

(3)

A prokaryotic cell is characterized by the absence of an organized 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.