This comprehensive study guide covers the main terms and concepts needed for a biology unit on animals.

An overview of the structure and function of a complex, multicellular organism. This article discusses levels of organization and examples of systems.

Students can test their knowledge of the principles of regulation with this seven question multiple-choice quiz.

Students have the opportunity to take this five question pretest to assess their knowledge of the principles of regulation in the human body.

Free interactive practice tests aid in learning the Prokaryote Endomembrane system, Cell membrane, Plant cell, Animal cell and Neuron cell. Tests are timed and keep track of right and wrong answers.

Tutorial with animated illustrations showing how vesicles work to transport materials inside a cell and release them through the cell's membrane to the outside.

Provides an in-depth look at the biology of cancer, including a detailed description of the disease process from the basics of cells to the diagnosis and treatment of various types of cancers. Includes videos, animations, and interactive...

Practice the steps of cloning in this interactive animation. Using what you know about somatic cell nuclear transfer, your mission is to create a genetically identical clone of Mimi, a brown female mouse. You'll answer a few questions at...

This tutorial examines how water moves through a plant. Follow the pathway that water takes through plants from the roots to evaporation from cells in the leaves. Learn what controls rates of transpiration, how environmental conditions...

Animations of the different phases of cancer, make this a great resource for understanding the development of this disease.

Learn about the disease diabetes and how it affects blood sugar in affected people, in this Mayo Clinic animated video. [2:10]

Learn about how cancer cells spread or metastasize throughout the body in this example animation video [1:28] of melanoma spreading.

This unit focuses on the unique structure and function of both invertebrate and vertebrate animals. Students review their understanding of animal diversity, and take a closer look at the various organ systems found in the animal kingdom.

Genes are turned on and off in many ways. This article covers chemical signal transduction. Article includes animations, pictures, video, biographical information, and quiz questions that are accessed by clicking on buttons along the...

Whether a chick can breathe inside its shell is an interesting question. Every animal needs oxygen to survive, so the chick must get air somehow. Try this science project to discover if the pores in a chicken egg shell allow water to...

An interactive, self-guided lesson on the function of the human immune system and how medical intervention prevents disease. This lesson has many descriptive animations as well as graphs and diagrams to help with understanding. There is...

This video segment from NOVA: "The Shape of Things" follows the growth of a duck embryo, from a single fertilized egg cell to a complex, hatching duckling. [1:19]

Web-based activity provides an opportunity for students to study cellular respiration in an up-close and personal way. By following atoms and molecules through an interactive animation, they will be able to see the changes that take...

Use this tutorial to enhance your understanding of how the human immunodeficiency virus invades healthy cells of the immune system. [3:15]

Animated slide show illustrating Morton Mandel and Akiko Higa's calcium chloride method of DNA transformation.

Click on the terms and you will be presented with a picture of the cell part along with a clear explanation of its role within the cell. Other links are provided for further clarification of terminology.

This website offers a clear definition of the science of Genetics, highlighting DNA and genes. There is a neat, easy-to-understand animated tour of the basics and an opportunity to go inside an animated cell. Student can build a DNA...

This video segment, adapted from the Interactive Secret of Life videodisc, explains the stages of mitosis, the process of dividing equally a cell's massive jumble of DNA just prior to cell division. [1:34]

In this activity, students use a virtual biology lab to perform investigations and learn lab procedures using compound and dissecting microscopes to look at a variety of animal and plant cells.