What is the role of the enzyme ligase in DNA replication?
A. It matches new bases to the old strand by complementary base-pairing.
B. It folds the DNA into a coiled structure.
C. It unzips the double-stranded DNA.
D. It seals any breaks in the sugar-phosphate backbone.
E. It breaks the hydrogen bonds that hold the two strands of the DNA together.
Answer: D
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A graph of phenotypic variation similar to the
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