A Gene is a Discrete Sequence is an interactive, animated tutorial that describes how researchers devised a procedure to sequence a section of DNAthe chain termination method. The thought process used to fit each clue into the solution is detailed in a step-by-step description with animations. The user is presented with a broad approach to learning about that concept; the tutorial has seven parts. First is a brief outline of the questions that lead to the concept followed by a statement of the concept. Second, there is a part labeled animation which is actually an animated tutorial with details of the experimental work and critical thinking that led to an understanding of the concept. There is also a picture gallery with images of historic photographs of researchers, labs, and laboratory equipment set-ups involved in the experiments described. There is a fourth part labeled Audio/Video that presents Real Player interviews with researchers who discuss the concept in more detail. This part also contains an audio glossary of key terms used in the tutorial. The fifth part presents biographies of the key researchers explained in the tutorial. Next is a problem to be solved using key points from the concept. The problem is usually a series of interactive, multiple-choice questions that require simple problem solving skills. The problem in this tutorial details how changes in the genetic code of the DNA (mutations) will impact the translation of that code. The final part contains external links to sites that provide more information on the concept; there is also a short bibliography.