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The basic unit of DNA is a nucleotide. Each nucleotide consists of three portions: a phosphate group, a five-carbon sugar and a nitrogenous base. DNA uses four nitrogenous bases: adenine, thymine, guanine and cytosine. More »

www.reference.com Science Biology Molecular Biology & DNA

The name of the twisted ladder shape of the DNA molecule is called a double helix. This is because it is constructed of two long strands that twist around each other to form a ladder-like structure. More »

www.reference.com Science Biology Molecular Biology & DNA

A nucleotide is the monomer unit of DNA. Nucleotides are composed of a sugar, a phosphate and a nitrogenous base. DNA is a polymer consisting of many of these monomers linked together. More »

www.reference.com Science Biology Molecular Biology & DNA
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