Abiochemist isolates, purifies, and combines in a test tube a variety of molecules needed for dna replication. when she adds 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 she probably left out of the mixture?

 biochemist isolates, purifies, and combines in a test tube a variety of molecules needed for dna replication. when she adds 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. 
 she probably has left out DNA ligase of the mixture