<prompt> True about mitochondrial DNAUGA codes for arginineCodes for 13 proteinHigh content of untranslated sequenceCircular double stranded DNA  <response>: 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 