This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Mendalian Inheritance, Subject name: Biochemistry
[{'content': 'Human Mitochondrial Genome encodes: \nSelect and explain. \nA. 37 genes, B. 47 genes, C. 57 genes, D. 67 genes', 'role': 'user'}, {'content': 'Answer: A \nExplanation: MITOCHONDRIAL DNA: Present in eukaryotes Circular, double stranded High rate of mutations because of : no introns (prevent mutations) no repair enzymes no proof reading 1% of total cellular DNA Maternally inherited Total 67 proteins of respiratory chain, out of which 13 are from mitochondrial DNA. Multiple copies are present in the same cell Contains: 4 stop codons. 16,000 base pairs(which is around 1% of total cell DNA) 37 genes encoding for: 2 r RNA, 22 t RNA 13 protein sub-units Contains own ribosome (55 S) and circular dsDNA.', 'role': 'assistant'}]