when cells at 30 degrees c were labeled with [ 3h ] -thymidine and then shifted to 46 degrees or 49 degrees c for 20 min , the profiles of sedimentation of their cellular dna in an alkaline sucrose gradient revealed a decrease in the size of dna to a quarter of that at 30 degrees c in the mutant , but not in wild-type cells .
C0012854
dna
C0000702
a