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Solution


Q.

Which structures perform the function of mitochondria in bacteria                  [2014]
1 Nucleoid  
2 Ribosomes  
3 Cell wall  
4 Mesosomes  

Ans.

(4)

Mesosome is a characteristic circular to villiform specialization of the bacterial cell membrane that develops as an ingrowth. It consists of vesicles, tubules and lamellae. Mesosomes may be septal or lateral. Septal mesosome connects the nucleoid with the plasma membrane and assists in replication and septum formation during cell division. Lateral mesosome is not connected with the nucleoid and contains respiratory enzymes, performing functions similar to eukaryotic mitochondria. Hence, it is also called chondrioid. They also increase the surface area of the plasma membrane and enzymatic contact.