[Free Registration/Login may be required to access all resource tools.] Watch videos, read grade-level texts, complete activities, and take assessments about prokaryotic and eukaryotic cells.

A set of virtual experiment assignments where students investigate the biochemistry of hemoglobin and the role it plays in the functioning of human red blood cells. Includes background information, glossary, online notebook, and...

[Free Registration/Login may be required to access all resource tools.] Introduces cells, tissues, organs, and organ systems in the human body.

A site about cell division and the cell cycle in the science of biology including mitosis, meiosis, and binary fission.

Provides a labeled diagram of a plant cell and descriptions of the characteristics and functions of many of its organelles.

Describes the different parts of a plant cell.

Discusses the discovery of the cell nucleus, its location, size, structure, composition, and functions.

Kids learn more about the science of the cell. Smallest biological form of life.

Kids learn about the viruses in the science of biology on this site. Find about how these tiny particles of DNA can make people and animals very sick when they invade a living organism's cells.

[Free Registration/Login may be required to access all resource tools.] Covers the role of the lymphatic system in the immune response.

This comprehensive study guide covers the main terms and concepts needed for a unit on the origin of life.

Explains what chromosomes are, how chromatids are related to them, and how they function together during cell division.

Microscopic images, detailed information, and illustrated diagrams help explain plant reproduction with a focus on fertilization.

A brief overview of the prokaryotes. The resource contains some interesting facts that will help you understand the great contrast that exists in the prokaryotic way of life.

Explains how an amoeba is able to move by altering the shape of its cell's cytoplasm and shifting between fluid and solid states. The amoeba can also form pseudopodium that allow it to move as well as to engulf prey through phagocytosis.

Investigate the scientific principles of biospheres, and observe the effects of biological processes on closed systems.

Describes the seven characteristics that define what life is for biological purposes.

Describes the characteristics of amoeba and their classification.

Describes the steps for how to make a model of DNA using colored polymer clay and wire. Students will gain a good understanding of the structure of DNA by doing this project.

Describes the structure and functions of the mitochondria.

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,...

Information about the functions vacuoles perform in different types of organisms.

Part of a year-long high school biology class online project, this page discusses the two major roles of lysosomes.

[Free Registration/Login may be required to access all resource tools.] Tutorial serves as an introduction to chromosomes. It defines genes, chromosomes, and homologous chromosomes, while providing an explaination of chromatids and...