Step-by-step explanation:
6) h. enzyme that adds nucleotides to a nitrogen base according to the base- pairing rules.
7) j. a five-carbon sugar
8) c. process of making a copy of DNA
9) b. one of the two pyrimidines
10) g. enzyme that opens up the double helix by breaking hydrogen bonds
11) i. two areas formed when the double helix separates during DNA replication.
12) d. makes up part of a nucleotide and is made up of one or two rings of carbon
13) e. one of the two purines
14) f. abbreviation for deoxyribonucleic acid
15) a. subunits that make up DNA