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Biology 12 Online
OpenStudy (anonymous):

Which of the following make up the steps or rungs of the DNA "ladder"? A. Base pairs B. Carbohydrate groups C. Cytoplasm D. Phosphate groups

OpenStudy (anonymous):

A

OpenStudy (anonymous):

phosphate groups are on the outside of the double-strand DNA, and base pairs connect them in the middle

OpenStudy (anonymous):

Oh ok thank s

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