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The DNA molecule is composed of three types of component molecule. Those are phosphate group, the sugar deoxyribose and the nitrogenous bases adenine, thymine, cytosine, guanine (A, T, C, G)

The RNA molecule is composed of phosphate group, the sugar ribose and the nitrogenous bases:  adenine, uracil, cytosine, guanine (A, U, C, G)

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