1. Varying the assay selected , changes the selective pressure on the cells and therefore can change what properties are used in the transformed cells .
2. If the selected assay varies , the selective pressure changes on the cells and can therefore change what properties are used in the transformed cells .

Select your answer from the options. Are these two sentences paraphrases of each other?
Pick from: 1. no 2. yes...I think the answer is
2.