Wiley animation dna replication

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In a double helix the strands are antiparallel.

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These asymmetric bonds mean each strand of DNA has a direction. The pentoses are joined together by phosphate groups that form phosphodiester bonds between the third and fifth carbon atoms of adjacent sugar rings.

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The backbone of the DNA strand is made from alternating phosphate and 2-deoxy-ribose, a pentose. The DNA chain is 22 to 26 Ångströms wide (2.2 to 2.6 nanometres), and one nucleotide unit is 3.3 Å (0.33 nm) long. DNA is a long polymer made from repeating units called nucleotides.

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