The cell phones have dramatically changed our way of life but at what cost? Learn the cons to these powerful machines in this article.

Informative text is clearly written and supported by good illustrations and charts as well. A quiz is also provided at the bottom of the site.

Students compare and contrast passive and active transport by playing a game to model this phenomenon. Movement through cell membranes is also modeled, as well as the structure and movement typical of the fluid mosaic model of the cell...

This page provides a fairly high level explanation of DNA replication with extensive graphics. Good description of this process.

Resource walks you through the four major stages of cellular respiration which include glycolysis, pyruvate oxidation, the citric acid or Krebs cycle, and oxidative phosphorylation and traces how they connect up to one another.

Explains oxidative phosphorylation, which is the fourth step of cellular respiration, and produces the most of the energy in cellular respiration.

Learn how a rotary phone transformed into the smartphones we have today in this article.

Alive or not, viruses are introduced in an easy to follow essay that explains many basic concepts.

Explains what cellular respiration is, its function, and the three stages it goes through when it takes place in a cell.

Get an inside look at how viruses reproduce in a host cell in this tutorial. Tutorial explores both the lytic and lysogenic cycle.

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...

This online biology book offers a comprehensive overview of cellular metabolism and fermentation. Content includes a look at glycolysis, anaerobic pathways, and aerobic respiration.

Students read an article about how the HIV virus replicates itself in a host cell, and the parts of an HIV particle. Includes labeled drawings of an HIV particle and of its replication cycle. The lesson materials and a set of PowerPoint...

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. [2:43]

This site from the PBS production, Scientific American Frontier "Never Say Die", includes a section entitled "The Clock of Life". It provides a discussion of cell death through shortening of the telomere. A good class activity included.

The equation for cellular respiration is given and a diagram is provided that illustrates the process with glycolysis, the Krebs cycle, and the electron transport chain shown. Each of these steps is explained and a summary of the total...

A good general review of aerobic and anaerobic respiration. Good graphics and good embedded vocabulary links.

Meiosis tutorial with clickable glossary, diagrams, and photos of cells as they move through the phases. A good site from the University of Manitoba.

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

This comprehensive study guide covers the main terms and concepts needed for a unit on the female reproductive system.

Every animal starts out as a single, fertilized cell. What happens then? Launch an interactive that showcases four similar-looking embryos. Can you guess what each one of them actually is? Watch them develop.

[Free Registration/Login Required] Generate comparison charts, crosswords, and journals for recording data on plants and plants processes. One can also find lesson plans and plant experiments, as well as flower and tree resources.

Discusses the structure of the matrix inside a mitochondrion and how hundreds of concentrated enzymes are held there. The matrix takes part in mitochondrial functions such as the Krebs cycle, the electron transport chain, ATP synthesis,...

[Free Registration/Login Required] This is a comprehensive, engaging overview of catabolic pathways that yield energy by oxidizing organic fuel. Students explore redox reactions, oxidation, reduction, and preview the stages of cellular...