This 11-page Biology course handout gives a detailed explanation of cell structure, supplemented by many illustrations.

An illustrated presentation introducing the structure and function of the cell, including the two different types of cells: prokaryotic and eukaryotic.

Students learn about the structure and function of the organs of the male reproductive system.

Evidence in support of endosymbiosis to show the evolution of organelles within cells.

The parts and functions of the mitochondria are described as well as the many illnesses that can result from mitochondrial dysfunction.

This site features a clear picture of the plant cell with a concise explanation of its key parts and their functions.

This article examines the basic principles of how cells communicate with one another using different kinds of short- and long-range signaling.

This is a thorough site which contains a glossary of plant/animal cell anatomy terms. Diagrams of both cells are included along with worksheets to label.

Learn about the hormones released by the pituitary gland, their target cells, and their principal actions, as well as the structure and function of the hypothalamus.

Very good science e-book that details why cells are the fundamental unit of life and why our health depends on what happens within the many different cells that make up our body. Each chapter is presented separately and the book can also...

In-depth information on all stages of cell biology as well as lesson ideas, tutorial diagrams, and online labs.

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.

The process of cellular differentiation leads cells to assume their final morphology and physiology - learn here all about this process.

Tutorial on DNA basics that goes along with an online quiz over the material. Use the naviagation buttons at the bottom of the page to go to the quiz over the material.

Check this out if you want only the basic information on structure and function of mitochondria. It is accurate, but not too detailed.

Describes the steps for making a model of a plant cell in two different ways. The first way uses mostly sweet foods and the second way uses a shoebox, clay, and simple materials.

Article takes a look at examples of the different ways cells can change their behavior in response to a signal at both the "micro" and "macro" levels.

Describes the structure and functions of a cell membrane.

Describes the structure and functions of the mitochondria.

The parts of an animal cell are presented with descriptions of each of its organelles.

A very brief explanation of the structure and function of this organelle.

Discusses the discovery of centrosomes, their important role in mitosis in animal cells, and their other functions.

Bobbi Seleski catalogs biology from our body and beyond, tracking how unicellular organisms, tissues, organs, organ systems, organisms, populations, communities, ecosystems, and our biosphere build off of each other and work together....

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