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The amino acid sequence of every protein in a cell, and the nucleotide sequence of every RNA, is specified by a nucleotide sequence in the cell's DNA.
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A segment of a DNA molecule that contains the information required for the synthesis of a functional biological product, whether protein or RNA, is referred to as a gene.
The storage and transmission of biological information are the only known functions of DNA.
Nucleotides have three characteristic components: a nitrogenous base, a pentose, and a phosphate.
The molecular without the phosphate group is called a nucleoside.
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