Which one of the following statements about human mitochondria is true?
A) About 900 mitochondrial proteins are encoded by nuclear genes.
B) Mitochondrial genes are inherited from both maternal and paternal sources.
C) rRNA and tRNA are imported from the cytoplasm and used in mitochondrial protein synthesis.
D) The mitochondrial genome codes for all proteins found in mitochondria.
E) The mitochondrial genome is not subject to mutations.