Q: DNA is made of repeating units called
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Answer : 1. "Nucleotides"
Answer: A) Nucleotides Explanation: DNA is a very long chain polymer made up of thousands of repeating units called nucleotides. Nucleotide Unit is composed of a phosphate group, a pentose sugar, and a nitrogenous base. The sides of the DNA ladder are made up of alternating deoxyribose sugar -- phosphate group units.