The four nitrogenous bases of DNA are adenine, thymine, cytosine and guanine, each of which pairs with different bases to form a rung on the DNA double helix ladder. Understand the basic construction of DNA with information from a biology teacher in this free video on science. Expert: Janice Crenetti Contact: WeAreHDTV.com Bio: Janice Creneti has a Bachelor of Science in secondary science education and a Bachelor of Art in biology from Boston University. Filmmaker: Christopher Rokosz
Orignal From: DNA Structure & Testing : What Are the Four Nitrogenous Bases of DNA?
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