Fully revised and updated, this new sixth edition is the perfect guide for those studying biology either in high school or college. The Dictionary offers more than 5,500 clear and concise entries, including more than 300 entries new to this edition. It provides comprehensive coverage of biology, biophysics, and biochemistry, includes biographical entries on key scientists, and features highlighted entries on important topics such as bioinformatics, genomics, molecular evolution, and protein structure. The new edition also features web links accessed via a companion website, featuring additional information that is regularly updated to ensure that it stays fresh. The volume also has many appendices, including a list of useful web sites, mass extinctions of species, and SI units, plus entirely new appendices on model organisms and their genomes and on Nobel prizewinners.