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The rungs or steps of DNA are made up of ____ which are attached to the sides or railings of DNA, which are made up of ___.
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The rungs or steps of DNA are made up of ____ which are attached to the sides or railings of DNA, which are made up of ___.

User Stitch
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Answer 1- Deoxyribose sugars. answer 2- Phosphate groups.
User Kyle Gagnet
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