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The question above is about the DNA structure topic. The correct answer to complete the sentence starting from the first blank would be sugar, phosphate, and nitrogen bases.
The completed sentence would be:
The side of the ladder are made up of alternating sugar and phosphate molecules. The steps (or rungs) of the ladder are made up of nitrogen bases held together by hydrogen bonds.
**The structure of DNA was established in 1953 by James Watson and Francis Crick. It was said that DNA structure was a double helix that is like a twisted ladder in which sugar is deoxyribose. As for the rungs of the ladder, they are pairs of 4 types of nitrogen bases.
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