Card sort race activity (revison or plenary)

I use this to check students' grasp of the sequence of events in DNA replication, based on AQA NT textbook. They work in pairs to see who can get the sequence correct in the shortest time. The colour of the text allows a rapid check of the sequence - when correct, it runs the colours of the visible spectrum from bottom (red) to top (violet). Of course, there&'s always a chance that some students will spot this as well...