"[These webpages] give a clear explanation on how the polymerase chain reaction works and why it is useful."
The activity is split into six different topics. In each children are asked questions on which they will receive feedback. Correct answers are rewarded with part of a picture being revealed. If all six questions are answered correctly, a bonus question appears.
The activity can be used by children working on their own, in groups or as a whole class. Group work will encourage discussion of the questions and introduction of related ideas.