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the sides of the DNA ladder are made of what? sugar and phosphate the steps of the ladder are made of what? four nitrogen bases What are the four nitrogen bases? A (adenine), T (thymimne), G (guanine), C (cytosine) A stands for.. adenine T stands for.. thymine G stands for.. guanine C stands for.. cytosine A joins with.. T T joins with.. A G joins with.. C C joins with.. G