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what does dna look like? dna is madeof several different chemical substances joined together in a form that looks something like a ladder. side parts of the dna structure are made up of two different molecules. one molecule is s sugar.
the other molecule is an acid. these two molecule connect to one another in a repeating order forming the sides of the dna structure. the pieces that hold the two sides of the structure together are called rungs.
each rung of the dna structure is made of certain chemical substances. these substances are called nitrogen bases using the letters a,c,g, and t.notice that it takes four of these letters to make one rung. these bases only join with each other to form each rung. only a joins with t. only c joins with g.