In an interactive exercise, learners identify the human body sites that harbor a normal resident flora and the sites that are sterile.

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

In this learning activity you'll evaluate the immune response including active, passive, natural, and artificial immunity.

In this interactive object, learners read the definitions of the parts of a cell and assemble a basic eukaryotic cell in a drag and drop exercise. A matching quiz involving cell terms and their definitions completes the activity.

In this learning activity you'll observe the growth of gram negative organisms and determine if they're lactose positive or negative.

Students read a description of audiograms. They review audiograms representing various degrees and types of hearing loss.

In this screencast, learners categorize different metabolic activities as catabolic or anabolic and follow a glucose molecule through the processes of glycolysis, aerobic respiration, and fermentation.

In this learning activity you'll investigate the interaction of antimicrobial therapies and host defenses in eliminating an infection.

Learners read about audiological tests including pure tone testing, air conduction, bone conduction, Speech Reception Threshold, and Speech Discrimination Score. They listen to sounds and words recorded at different decibel levels and see a graphic representation of decibel ranges. A brief review concludes the activity.

In this overview, students examine and identify mannitol positive and mannitol negative bacteria on mannitol salt agar.

In this screencast, learners read how microbes in such items as yogurt, bread, insulin, and insect sprays improve our lives.

In this learning activity you'll assemble the components of a prokaryotic cell and match the names and functions with each structure.

Students choose the hypothesis and practice describing bacterial colonies using the steps of the scientific method.

In this animated learning object, learners examine the regulation of inducible operons in bacterial systems.

Learners watch a brief video clip. They then follow step-by-step instructions on how to do a urine colony count and examine the criteria for determining if a colony count represents an infection. A brief quiz completes the object.

Learners examine microscope images of blood agar and the various types of hemolysis that can be detected. A quiz completes the activity.