Explains what parasitism is and provides a few examples of parasitic relationships.

Understandable lessons about numerous aspects about the composition, function, and interactions of proteins. Each starts with an interactive quiz and links to a tutorial.

[Free Registration/Login may be required to access all resource tools.] Translation involves translating the language of nucleotides to the language of amino acids. During this activity, translation in protein synthesis is explored along...

[Free Registration/Login may be required to access all resource tools.] Explore the interactions animals have with the environment in this resource.

[Free Registration/Login may be required to access all resource tools.] A close look at how animals and the environment interact with one another and specifically how the feeding relationships in a food web.

[Free Registration/Login may be required to access all resource tools.] In this interactive lesson students will describe the two major divisions of the peripheral nervous system and their functions.

[Free Registration/Login may be required to access all resource tools.] In this interactive tutorial students will learn to explain how the heart pumps blood throughout the body. Students will explain the composition of blood and will...

[Free Registration/Login may be required to access all resource tools.] In this interactive tutorial students will explain how the urinary system filters blood and excretes wastes.

This module focuses on cell structure and how the organelles function together to form the smallest unit of life. The cell theory is also discussed along with the basics features of the cell. Site also includes an interactive practice...

Article looks at different types of receptors and ligands, seeing how they interact to turn information from outside the cell into a change inside the cell.

An interactive activity designed for you understand the scientific method and how to analyze your data. A step-by-step and personalized experiment geared toward the topic of toxicology.

[Free Registration/Login Required] This is a flipchart that goes through the stages of cell mitosis. The students will have the opportunity to view websites on cell mitosis. Students can also match the stages of mitosis with their...

This interactive demonstrates the cloning of the sheep Dolly.

View the skeletal part of the goat and then test your knowledge on this interactive site. Immediate feedback provided.

[Free Registration/Login may be required to access all resource tools.] Videos, texts, activities, and assessments about food chains and food webs in an ecosystem.

This is a collection of courses on communities and ecosystems. Some topics explored are productivity, food webs, and ecology. The courses offer video clips, lecture notes, practice problems, and exam questions. Practice problems and exam...

[Free Registration/Login may be required to access all resource tools.] Ecology is the study of how living organisms interact with each other and with their environment. Organisms interact with each other through various mechanisms, one...

In this interactive module, you will learn how metabolic acidosis or alkalosis can arise and how these conditions shift the bicarbonate equilibrium. The body's compensatory mechanisms and treatment options are also discussed.

In this interactive tutorial you will discover that the cytoskeleton is both a muscle and a skeleton, and is responsible for cell movement, cytokinesis, and the organization of the organelles within the cell.

This interactive tutorial is designed to help you understand the events that occur in process of meiosis, which takes place to produce our gametes.

This interactive module will help you understand the basic anatomy and physiology of the respiratory organs, primarily the lungs. You will learn about lung development, respiratory toxicology, secondhand tobacco smoke, asthma, and lung...

This interactive module introduces students to the basic concepts of development in a variety of organisms. Students will also learn about the experiments that gave scientists in the early 20th century insight into the mechanisms of...

In this interactive module students will learn what birth control methods are available in the United States, how they work and how effective they are in preventing pregnancy.

[Free Registration/Login may be required to access all resource tools.] Fungi don't live in isolation. They often interact with other species. In fact, fungi can be dependent on another organism for survival. When two species live close...