Which of the Following is NOT Universally Encoded by the Mitochondrial

Question

Which of the following is NOT universally encoded by the mitochondrial DNA?
A) Small ribosomal RNA
B) Large ribosomal RNA
C) A cytochrome oxidase subunit
D) Transfer RNA

Accepted Answer

Common to all mitochondrial genomes that have been sequenced so far are genes encoding ribosomal RNAs, the largest subunits of the cytochrome oxidase complex, and cytochrome b. tRNA genes are common to most, but are not in the most minimal organelle genomes.