This workbook contains laboratory exercises designed for use in a college introductory biology course. Each exercise helps the student develop a basic science skill. The exercises are arranged in a hierarchical sequence suggesting the scientific method. Each skill facilitates the development of succeeding ones. Activities include Use of the Microscope, Cell Types, DNA Replication, and Inheritance of Genetic Traits. Process skills such as observing, integrating, classifying and predicting are emphasized. Most exercises are structured to fit into a two-hour laboratory period. Each exercise provides general objectives, behavioral objectives, introduction, materials and equipment, procedure, references, and report sheet. (MA)