To link nucleotides together in a chain or polymer, covalent bonds are formed between the phosphate of one nucleotide and the pentose sugar of the next nucleotide. Nucleic acids are always added to the growing polypeptide in the same way: the ____ of the nucleotide being added is linked by a ____ bond to the ____ sugar of the previous nucleotide. Linking together ____ in this way creates a series of alternating ____ and phosphate groups. With a chain of ____, oxygen, and phosphorus atoms covalently bonded together. This forms a strong phosphate ____ in DNA molecules.

Activity || Nucleic acids 2.3

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