Chapter 12: DNA and RNA. Wheatley-Heckman Honors Biology/Chemistry. DNA. DNA is a long molecule made up of units called nucleotides . Each nucleotide is made up of 3 basic components: 5-carbon sugar (deoxyribose) Phosphate group Nitrogenous base.
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The two strands are said to be “complementary”.
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In a deletion, the loss of a single base is deleted and the reading frame is shifted.