What are the rungs of the DNA ladder made of?
A) phosphates and sugars B) nitrates and sugars C) nitrates and phosphates D) sugars and hydrates
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The ladder-like DNA double helix is made up of six molecules. The rungs of the ladder or the steps are made up of the nitrogenous purine bases adenine and guanine as well as the nitrogenous pyrimidine bases thymine and cytosine.
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