Ten multiple-choice test practice questions covering bacteria and viruses. Students have the opportunity to check their answers after submitting their results.

Discusses what bacteria and viruses are and the differences between them.

[Free Registration/Login may be required to access all resource tools.] We have all heard of viruses. The flu, the common cold, and many other diseases are caused by viruses. But what is a virus? Do you think viruses are living? Which...

The Tree of Life is a multi-authored, Internet distributed project containing information about phylogeny and biodiversity. The Tree of Life can be used to locate information about a particular group of organisms through their taxonomy.

Take this interactive, multiple-choice quiz over microorganisms, then review your score and any missed questions at the end.

[Free Registration/Login may be required to access all resource tools.] In the following tutorial you will learn about the barriers that keep most pathogens out of the human body.