41. Ribozymes are RNA molecules that function as enzymes, catalyzing reactions during RNA splicing. 42. Growth at two replication forks arising from a single origin of replication produce a “bubble” as daughter DNA molecules form. 43. During the replication of DNA, DNA polymerase has to synthesize the daughter strand in the 5′ to 3‘ direction because DNA polymerase can only join nucleotides to the 3′ end of the growing new strand. 44. Telomerase is an enzyme that unwinds DNA during DNA replication.  Â
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