The effectiveness of science experiments often are partly dependent upon the amount of classroom time available for implementation. This factor alone has frustrated many teachers who attempt to complete laboratory assignments in the allotted time period. This document provides experiments that were designed for the middle year in a 3-year biology program for grades 7-12. Each lesson is designed for 1-hour periods. This document is divided into five parts: (1) Getting Started; (2) The Cell; (3) The Flow of Life; (4) Invertebrates; and (5) Vertebrates. Some of the experiments provided discuss the following topics: (1) chemical models; (2) organic components, (3) acids, bases, and buffers; (4) cells; (5) food and respiration; (6) DNA models; (7) mitosis and meiosis; (8) gene mutations; (9) blood typing; (10) fossil boy; (11) pedigree studies; (12) invertebrates; (13) vertebrates; (14) circulatory, digestive, and respiratory systems; and (15) touch receptors. The appendices contain a glossary of terms, a list of suppliers of equipment, materials, and teaching aids, as well as an answer key. (ZWH)