This lesson will introduce viruses and explain how they are similar and different to Prokaryotic and Eukaryotic Cells. It is 3 of 4 in the series titled "Viruses."

This lesson will introduce viruses and explain how they are similar and different to Prokaryotic and Eukaryotic Cells. It is 4 of 4 in the series titled "Viruses."

This lesson will introduce viruses and explain how they are similar and different to Prokaryotic and Eukaryotic Cells. It is 1 of 4 in the series titled "Viruses."

This page provides a fairly high level explanation of DNA replication with extensive graphics. Good description of this process.

This resource provides detailed information on each of the periods within the Precambrian Era. It discusses what earth was like, what the first multiple cell organisms were like and when they appeared.

This lesson presents the organizational categories of living things. It is 1 of 3 in the series titled "Three Domains/ Five Kingdoms /Taxonomy."

[Free Registration/Login may be required to access all resource tools.] How simple cells evolved.

[Free Registration/Login may be required to access all resource tools.] How simple cells evolved.

Describes the characteristics of archaebacteria, the different subgroups, and the importance of archaebacteria.

This digital textbook covers core biology concepts and includes interactive features, real-world examples, videos, and study guides.

This digital textbook covers core life science concepts and includes interactive features, real-world examples, and videos.

This site provides a brief explanation of what a eukaryotic cell is along with detailed picture of a plant and animal cell.

Take this practice quiz to test your knowledge of cells. See how fast you can name the parts of the six different cells. By changing the level, it is appropriate for students of all grades.

Describes the characteristics of unicellular and multicellular organisms and gives examples for each.

A unicellular organism is made of only a single cell. Its characteristics are described and several examples are provided.

A basic explanation of how chloroplasts and mitochondrion produce energy within the cell. Various terms presented are explained in a clear and easily understandable manner.

Visit the tree of life and discover characteristics, habitats, and examples of the world's true bacteria.

This site is a description of the history behind the 5 Kingdom system suggested by Robert Whittaker. An extensive list of resources is included.

Find out what bacteria are, what they do, and what they look like.

This lesson will illustrate the structure and function of the cell. It is 4 of 4 in the series titled "Cells: The Structural and Functional Units of Life."

This lesson will illustrate the structure and function of the cell. It is 1 of 4 in the series titled "Cells: The Structural and Functional Units of Life."

[Free Registration/Login Required] This Flipchart will go over the basic parts of a cell.

Explains what archaebacteria are, the different phyla, and the characteristics of archaebacteria.

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