This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of nucleic acids, Subject name: Biochemistry
Function of mitochondrial DNA 
Select and explain. 
A. Encodes protein of cell membranes, B. Encodes proteins of respiratory chain, C. Helps in cell replication, D. Formation of rRNA
B: Encodes proteins of respiratory chain
Answer: B: Encodes proteins of respiratory chain 
Explanation: Mitochondria contains specific DNA .The integral inner membrane proteins ,are made by mitochondrial protein synthesizing machinery. However, the majority of proteins,especially of outer membrane are synthesized under the control of cellular DNA. The division of mitochondria is under the command of mitochondrial DNA. REF :DM VASUDEVAN TEXTBOOK ; 7thEDITION ;PAGE NO :13