Organisms have a variety of relationships. In this lesson, students learn to categorize relationships according to their impact on organisms and the terminology for these biological interactions.

Explore careers in biological science. This site is run by Howard Hughes Medical Institute and includes many types of virtual laboratories, animations, virtual exhibits, and interactive activities.

[Free Registration/Login may be required to access all resource tools.] Covers interactions between organisms.

Highly interactive learning materials in the study of biology, used to support the lecture, laboratory, and discussion sessions of general education courses.

Instructional module focusing on biological classification. Discussion includes Carolus Linnaeus' taxonomic classification system for organizing and classifying living things. Site also includes an interactive practice quiz and links...

The Merck Manual describes the human heart and shows how the heart pumps blood. Includes interactive 3D models.

Instructional module focusing on binomial nomenclature. Discussion includes Carolus Linnaeus' taxonomic classification system for naming all species. Site also includes an interactive practice quiz and links relating to the topic.

In this third unit of a Biology course, students learn about cells and cell structure. They compare prokaryotic and eukaryotic cells and learn about the specialized structures in a cell and what their functions are. They will also learn...

Based on the principle of antibody-antibody interaction, this ELISA test for HIV detection allows for easy visualization of results and can be completed without the additional concern of radioactive materials use.

Interactive resource provides a problem set in which you will work with the types of genetic and biochemical information used to unravel the inner workings of the lac operator-repressor regulation system. Correct answers are reinforced...

Interactive resource provides students with an opportunity to work through a problem set over nucleic acids. Correct answers are reinforced with a brief explanation. Incorrect answers are linked to tutorials to help solve the problem.

Instructional module focusing on Charles Darwin's explanation of natural selection as the mechanism for evolution. Discusses how this force of natural selection promotes changes in species over time. Site also includes an interactive...

Instructional module focusing on Charles Darwin's theory of Descent with Modification. Discusses how slight changes from parent to offspring create variation and potentially create new species over time. Site also includes an interactive...

Instructional module focusing on Gregor Mendel's scientific legacy and analysis of multiple genetic traits. Discussion includes Mendel's work on his second law, the Law of Independent Assortment, which states that different traits are...

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

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

An investigation of how polar and nonpolar interactions affect shapes of biological molecules and their function. Modules explore the following: 1. Why don't oil and water mix? 2. Can a substance dissolve in both a nonpolar and a polar...

Through informational text, interactive activities, animations, and video clips, students examine the chemistry of living things, and they learn how interactions from atoms are fundamental to life as we know it.

Through informational text, interactive activities, animations, and video clips, students investigate evolutionary biology.

Through informational text, interactive activities, step-through animations, and video clips, studnet explore biochemistry and the molecules that make up living things.

An interactive module where students take a closer look at cells and relate their structure to function. They also discover how cell organelles work in systems to maintain important biological processes and how cells communicate.

A complete, interactive course where students analyze the nature of the relationships between structures and functions in living cells.

This interactive learning module allows AP Biology students to explore the principles of Mendelian genetics and non-Mendelian patterns of inheritance. Students will also study the role of chromosomes in heredity.

Through informational text, interactive activities, practice problems, and video clips, students analyze how biological traits are passed on to successive generations.