A biochemist isolates and purifies various molecules needed for DNA replication. When she adds some DNA, replication occurs, but each DNA molecule consists of a normal strand paired with numerous segments of DNA a few hundred nucleotides long. What has she probably left out of the mixture?
A)DNA polymerase
B)DNA ligase
C)nucleotides
D)Okazaki fragments
E)primase

Question

Quizplus · Accepted Answer

The presence of numerous segments of DNA a few hundred nucleotides long suggests that the Okazaki fragments are being synthesized, but are not being joined together. This indicates a lack of DNA ligase, which is responsible for joining Okazaki fragments on the lagging strand during DNA replication.

A Biochemist Isolates and Purifies Various Molecules Needed for DNA