True about mitochondrial DNA
The protein synthesizing machinery of mitochondria is distinct from that in the cytoplasmThere are only about 22 tRNA in mitochondria but there are 31 tRNA species in cytoplasm The discovery of difference in codons representing different amino acids in mitochondria has now changed the universal nature of the genetic code For example, UGA is a terminator codon in nuclear DNA but codes for arginine in mitochondrial DNARef: DM Vasudevan, 7th edition, page no: 599
UGA codes for arginine
Codes for 13 protein
High content of untranslated sequence
Circular double stranded DNA
Metabolism of nucleic acids