DNA, RNA, Chromosomes, and Genes


Where is DNA found in a cell?

In addition to the nuclear DNA of eukaryotic cells, mitochondria (an organelle found in both plant and animal cells) and chloroplasts (found in plant and algal cells) both contain DNA. Mitochondrial DNA contains genes necessary to cellular metabolism. Chloroplast DNA contains genetic information essential to photosynthesis. (For more about cells, see the chapter “Cellular Basics.”)


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