Describes an experiment designed to use the ability of duckweed to convert the secondary hydroxyl moieties into ketone groups. Discusses the preparation of plant material, materials, procedures, and results for this biotransformation experiment for undergraduate students. (CW)

Describes three activities, substrate inhibition, product inhibition by fructose and glucose, and gel immobilization of invertase for use with undergraduate biochemistry classes. Discusses materials, methods, and results. Stresses the advantages of practical exercises in undergraduate classes. (CW)

Describes several experiments that explore the methodology available to the forensic serologist for typing a human bloodstain in the ABH grouping system. Presents ABO blood group of wet blood, Lattes Crust test procedure, and the absorption-elution procedure. Uses outdated blood; equipment requirements are minimal. (ML)