Learners examine the function of each part of a microscope and follow step-by-step instructions on how to focus on a specimen. They also review the proper use and care of a microscope and test their knowledge in two drag-and-drop exercises.

Learners view video clips demonstrating Gram's staining procedure. Correctly stained slides are shown.

Learners view video clips demonstrating acid-fast staining procedures. Correctly stained slides are shown. The learning object includes two matching exercises.

Learners read about endospores and view video clips demonstrating spore staining procedures. Correctly stained slides are shown.