Question

ligase joins fragments together by connecting their backbones. this means that it connects ______.
adenine to thymine
guanine to cytosine
nitrogen bases
sugar to phosphate
dna to rna
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Explanation:

Ligase is an enzyme that joins DNA fragments by connecting the sugar - phosphate backbones. Among the given options, "sugar to phosphate" describes the part of the DNA (or nucleic acid) structure that ligase connects when joining fragments. Adenine - thymine and guanine - cytosine are base - pairing interactions, nitrogen bases are the rungs of the DNA ladder, and DNA to RNA is transcription, which is not related to ligase's function of joining fragments.

Answer:

sugar to phosphate