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)DNA ligase
C)Okazaki fragments
D)primase

Question

Quizplus · Accepted Answer

The student has likely left out DNA ligase, which is necessary for joining Okazaki fragments (short segments of newly synthesized DNA on the lagging strand) into a continuous strand. Without DNA ligase, the newly synthesized DNA will consist of multiple segments instead of a continuous strand. DNA polymerase, primase, and other molecules necessary for DNA replication are present in the mixture, as replication is occurring.

A Student Isolates,purifies,and Combines in a Test Tube a Variety