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Life Science

  • Bacterial Hydrolysis of Casein In this lab, students culture two bacteria on skim milk agar. The protein casein gives milk its white color. Some bacteria secrete protease enzymes that can hydrolyze casein. When these bacteria are grown on skim milk agar a clear area develops around the colonies, indicating that casein has been hydrolyzed into its component amino acids. View »
  • Bacterial Hydrolysis of Starch In this lab, students culture two bacteria on potato dextrose agar, which contains starch. When grown on potato dextrose agar, bacteria that can secrete amylase—an enzyme that hydrolyzes starch—create a zone around their colonies in which starch is absent. When the agar is flooded with iodine solution, most of the plate stains dark blue–black, but clear areas are left around colonies that secrete amylase. View »
  • Bees at School Bradley James, co-owner of Beepods, explains the benefits of keeping bees at school. Learn about the buzz, and why bees are the perfect organism to engage students and promote hands-on learning. View »
  • Butterfly Necklace Use this activity to give students an understanding of the life cycle of the painted lady butterfly. Includes materials list and step-by-step instructions. View »
  • Bacteria: The Citrate Test In this lab students perform a test on two different bacteria to determine whether the organisms can use citric acid as their sole carbon source. The citrate test is often performed as part of the IMViC (Indole, Methyl Red, Voges-Proskauer, and Citrate) series of tests used to differentiate common species of enteric bacteria. View »
  • Amazing Bugs® Beetle Races: Observation Sheet Students can record their observations of the darkling beetle on this sheet. View »
  • Introduction to Prokaryotes: Cyanobacteria In this lab students observe two examples of cyanobacteria and make a simple comparison to a eukaryotic green alga. View »
  • Introduction to Sterile Technique In this lab, students practice transfer of a bacterial culture using sterile technique. View »
  • Meet the 12-Spotted Lady Beetle Explore the fascinating life cycle of the lady beetle with the help of this infographic. View »
  • How Do They Hiss? and Other Madagascar Hissing Cockroach Questions Answered The Madagascar hissing cockroach is one of the most widely recognized exotic insects because of its large size and dynamic behavior. Read on to learn more about it . . . View »
  • Isolating Bacteria from a Mixture How does a microbiologist isolate bacteria from a sample? In this lab students practice streaking a plate to isolate a single species of bacterium from a known mixture. View »
  • Introduction to Prokaryotes: Archaea In this lab, students are introduced to Halobacterium, a representative of the Archaea, one of the three domains of life (along with Bacteria and Eukarya). View »