This website provides exceptional interactivity. Users have the option of first reading through a text-style tutorial, and then testing their knowledge in either a series of randomized questions from a large selection, or in a systematic path from beginning to end that prevented jumping ahead (dependent upon each sections design). Topics are presented in a sequence that is logical to the subject, but different sections may be selected at will. This site was reviewed for part of a lesson plan assignment; it took several hours to travel and learn from the entire site; it would be great to use it in the classroom.
An exceptional variety of learning techniques were used in this site. The amino acid structural building graphics, and all of the equations and chemical formula, exhibit different approaches for all types of learners and not a typo to be found. There were no troubles in switching amongst its numerable relevant topics, and its use could be adapted for students preparing for tests on their own or for classroom use. Concepts and models are not only educationally significant; they are highly relevant and very well done.