This publication is the third of a series of seven supplementary investigative materials for use in secondary science classes providing up-to-date research-related investigations. This unit is structured for grade levels 7 through 12. It is concerned with the role of carbohydrates as important nutrients for consumers. This guide will enable students to study and identify certain carbohydrates. The first part of this guide provides the teacher with: (1) materials needed; (2) background information; (3) preparing reagents; and (4) suggested reading and films. The second part provides students with background information and two investigations: (1) testing for unknown carbohydrates, and (2) determination of stored carbohydrates in vegetables. Each investigation consists of: (1) materials needed for a four-student team; (2) procedures; (3) questions for thought; (4) extending the investigation; and (5) suggested readings. (HM)