The tRNA molecules are themselves copies of DNA genes in the nucleus.

Of course, these enzymes are also coded for by a DNA gene in the nucleus.

The information carried by DNA is held in the sequence of pieces of DNA called genes.

The region contains several tandem copies of ribosomal DNA genes.

The amino acid sequence of any polypeptide created by a cell is in turn determined by the stretches of DNA called genes.

In his thinking about the processes linking DNA genes to proteins, Crick made clear the distinction between the materials involved, the energy required, and the information flow.

Such diseases are caused by an error in a single DNA gene.

Fanconi anemia is an inherited blood disorder due to abnormal breakouts in DNA genes.

You can read the article How Cells Work to learn about DNA, genes and gene splicing.

This interpretation was corroborated by a 2006 phylogenetic analysis based on three mitochondrial DNA genes.