[Free Registration/Login may be required to access all resource tools.] A complete, web-based, multi-media textbook which serves as a comprehensive overview of Biology concepts.

[Free Registration/Login may be required to access all resource tools.] A complete, web-based, multi-media textbook covering a wide variety of Biological science concepts for middle grades.

Through full-color images and concise information, learn about the origin of cells. Discover some of the notable studies surrounding the history of life on Earth.

Discover the world of bacteria from their importance in the development of more complex life forms to how they use flagella to move. Highlights the characteristics of cyanobacteria.

[Free Registration/Login may be required to access all resource tools.] Introduction to the properties of viruses.

Take an interactive quiz over bacteria. After completing the quiz, check your score, and then revisit any incorrect question for further review.

Andrea M. Henle examines the science behind gene editing tools such as CRISPR.

Use this resource to discover the basic structure of a eukaryotic cell and some of the organelles it contains.

This investigation allows young scholars to observe cells from multiple sources. Plant, animal and bacterial cells will be observed as well as cells from multicellular organisms and single-celled organisms. After providing written...

In this unit you will learn about the origin of the cells and their differences. It includes 15 interactive activities.

An encyclopedia article on viruses discusses what they are and their different classifications. It also gives several examples of viruses, how they can be treated, and gives speculation on their origins.

This site lets students practice vocabulary words related to cell organelles. The same vocabulary words are presented in one of four different games for students.

In this instructional activity, students learn the different kinds of cells including plant and animal cells. They also learn how to identify and name the organelles of eukaryotic cells.

This lesson will provide the characteristics of the domain Bacteria.

This lesson will introduce the cell's structure and function.

[Free Registration/Login may be required to access all resource tools.] Bacteria are the most successful organisms on the planet. They lived on this planet for two billion years before the first eukaryotes and, during that time, evolved...

Take an interactive quiz over the classification of living things. After completing the quiz, check your score, and then revisit any incorrect question for further review.

This lesson will illustrate the structure and function of the cell. It is 3 of 4 in the series titled "Cells: The Structural and Functional Units of Life."

Explains the structure of DNA and the seven steps that take place during DNA replication. Includes a labeled illustration for each step.

This resource describes the structure and functions of the cell membrane.

Describes the characteristics of cocci bacteria, their shape, how they arrange themselves in pairs and groups, common forms of cocci, their method of reproduction, and types of cocci that cause diseases in humans. Includes examples of...

This lesson covers the basic elements of cell theory.

Review how the human body regulates gene expression.

Learn more about the operon model based on studies of lactose-dependent mutations of E. coli with the series of problems presented here. The correct answers have a brief explanation to reinforce the theories and incorrect answers are...