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Life Science

  • Bacterial Motility In this lab, students perform two exercises that investigate microbial motility. One is on a microscopic level, using the “hanging drop” slide preparation method to directly observe motile cells. The second exercise is on a macroscopic level and involves inoculating motility test media. View »
  • Human Body: Endocrine System Teach the functions of the endocrine system with this infographic. View »
  • The Science of Fear You know that hair-raising feeling you get when you’re scared? By undergoing a specific physiological response, your body is primed to confront, and hopefully overcome, whatever scary situation you face. View »
  • Bacteria: The Indole Test In this lab students perform a differential test to distinguish bacteria based on the production of indole. Bacteria are grown on media containing tryptophan and then treated with Kovac’s reagent. If they possess the enzyme tryptophanase, the bacteria can metabolize tryptophan into indole, pyruvic acid, and ammonia. 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 »
  • Dissections in a Flipped Mastery Classroom Dissection plays an essential role in every anatomy and physiology class. As a teacher, you know it’s valuable, but do your students? Show them the value of performing dissections and give them a learning experience that’s authentic and engaging when you use the flipped-mastery approach. 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 »
  • Bacterial Growth on MacConkey Agar In this lab students culture three bacteria on nutrient agar and MacConkey agar and record the results. 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 »
  • 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 »
  • Bacterial Hydrolysis of Lipids In this lab, students culture two species of bacteria on agar medium that contains an emulsion of plant oils and the dye, sprit blue, which forms a complex with the triglycerides of the oils and gives an opaque blue color to the agar. Colonies of bacteria that can secrete lipase, an enzyme that hydrolyzes triglycerides, develop a light area or “halo” in the surrounding medium, due to the diffusion of lipase into the medium and the resultant breakdown of the oil/spirit blue complex. View »