Was the Okazaki fragment experiment ever replicated?
Formation of Okazaki fragments in polyoma DNA synthesis caused by misincorporation of uracil - Brynoff, et.al. Cell; Volume 13, Issue 3, p573–580, March 1978 one of many, but you only need one to disprove your professor. 

You do not always need to replicate the exact same assays in order to validate a model. Replicate means reproduce the same experimental results in which to draw the same conclusion. Another person need not reproduce your work exactly, so long as your results were the results of experiments that you were able to reproduce on your own. Standards for Replication in Science