Learn about how ecology is simply the study of how and why organisms interact with their environments.

Numerous molecular biology interactive activities along with a program that can automatically keep models and reports to keep track of progress.

Try these puzzles as a review for quizzes and tests. There are interactive versions that are fun to try while on-line as well as printable versions. Puzzles cover a wide variety of general biology plus more specific ones on botany.

In this learning module from The Concord Consortium, students will investigate how polar and nonpolar regions in big molecules interact to result in certain shapes and properties for those molecules.

In this activity, students explore several models representing the growth (or decline) of a biological population. They study models of a single population that have a closed-form solution, and models of several interacting populations...

Answer five comprehension check questions about the nature of science in this interactive quiz.

Answer five comprehension check questions about cnidarians and sponges in this interactive quiz.

[Free Registration/Login Required] Interactive shows a graph illustrating the effect of pH on pepsin's reaction rate.

Test your understanding of the human body and all of its complexities with these interactive worksheets, games and quizzes.

Interactive animation illustrates how Charles Darwin used his study of finch beaks to explain evolution. A phylogenetic tree diagram shows how the birds' color and beak shape changed over generations.

If you want an interactive way to practice karyotyping, this is it. There are three patient histories and karyotypes to use in diagnosing human genetic disorders. There is enough information on comparing chromosomes to get you started.

Instructional module focusing on the discovery that DNA is the genetic material on which life is built. Discussion includes the key evidence that bacteria could be transformed by adding DNA from other bacteria. Site also includes an...

Instructional module focusing on the physical structure of DNA. Discussion incorporates the description of the nucleotides, base pairs, and the double helix shape of a DNA molecule. Site also includes an interactive practice quiz and...

Instructional module focusing on the discovery and study of DNA replication. Discussion incorporates how scientists were able to observe DNA replication through a technique called DNA synthesis assay. Site also includes an interactive...

Instructional module focusing on Gregor Mendel's Laws of Inheritance. Discussion includes Mendel's discovery of dominant and recessive traits as well as co-dominance and incomplete dominance in genetics. Site also includes an interactive...

[Free Registration/Login may be required to access all resource tools.] Instructional videos, grade-level texts, study aids, and interactive activities about prokaryotic and eukaryotic cells.

A fantastic interactive laboratory in which transgenic flies are created and used to study circadian rhythms. Excellent supporting information and resources for teachers and students.

Imagine having a microscopic camera so small that you could travel inside a cell. This interactive site allows you to do just that. Click on any one of eight individual parts of the cell--cell membrane, nucleus, DNA, RNA, ribosome,...

This web resource provides basic information about structure and function of plant organelles through a large interactive cell drawing, as well as many opportunities to explore further. Links lead the learner to several short movies of...

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

Students review the study of living things and make connections back to Earth's systems. This unit focuses on how various species, grouped in populations and communities, work with the nonliving things around them to ensure survival.

Assess your understanding of cells and their function with this interactive multiple choice quiz. Immediate feedback is provided.

Article reviews Mendel's basic model of inheritance then provides an overview of variations on Mendel's laws, including multiple alleles, incomplete dominance, co-dominance, pleiotropy, lethal alleles, sex linkage, genetic interactions,...

[Free Registration/Login may be required to access all resource tools.] Introduction to ecosystems and other ecological concepts.