A student isolates, purifies, and combines in a test tube a variety of molecules needed for DNA replication. After adding some DNA to the mixture, replication occurs, but each DNA molecule consists of a normal strand paired with numerous segments of DNA a few hundred nucleotides long. What has the student probably LEFT OUT of the mixture?
A. DNA polymerase
B. primase
C. Okazaki fragments
D. DNA ligase
Ans: D. DNA ligase
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