Question: the flask was washed with a small volume of acetonitrile, which was also transferred to the tubes.
Answer: --> The flask was washed with a small volume of acetonitrile, which was also transferred to the tubes.

Question: this is important and very promising.
Answer: --> This is important and very promising.

Question: the cell controls, which genes are active and which are inactive.
Answer:
--> The cell controls, which genes are active and which are inactive.