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This is an easy to use site and the assignment that I use challenges the students to apply information from cell and molecular biology courses to a real problem, that is identifying an unknown virus based on describing tests to be performed. It is surprising how few can actually describe how to determine whether the genetic material is DNA or RNA when first confronted with the problem. The overall usefulness of the taxonomic key in identification is compromised by current molecular techniques (probes and sequencing) that can more quickly provide the desired information.