University of California
Organic Structures:the Architecture of Life
Article discusses how objects in nature are held together through balanced forces. Scroll midway down to find info on microtubules and microfilaments. Links to excellent electron micrographs.
University of Arizona
University of Arizona: Cytoskeleton Tutorial
Complete descriptions of microtubules and microfilaments. Flip to the following pages to go through a cytoskeleton tutorial with graphics of cross-sections and diagrams. You can test yourself at the end.
CK-12 Foundation
Ck 12: Cytoplasm and Cytoskeletons
[Free Registration/Login may be required to access all resource tools.] Tutorial provides an overview of the roles and functions of the cytoplasm and cytoskeleton.
Khan Academy
Khan Academy: The Cytoskeleton
There are three types of protein fibers in the cytoskeleton: microfilaments, intermediate filaments, and microtubules. This resource examines each type of filament, as well as some specialized structures: flagella, cilia, and centrosomes.
Other
University of Cincinnati: Cells and Organelles
An in-depth discussion of the different parts of eukaryotic and prokaryotic cells as well as a thorough explanation of organelles within the cell. The text is better suited to high school and middle school. However, there is a picture of...
Florida State University
Florida State University: Molecular Expressions: Introdution to Cell and Virus Structure
This resource provides a detailed diagram of animal, bacterial and plant cells and viral structure. Also included are detailed drawings, with definitions, of each of the cellular organelles.
Biology 4 kids
Biology4 Kids: Microfilaments Stringy Proteins
A short, informational text piece which explains the structure and function of microfilaments inside a cell.
CK-12 Foundation
Ck 12: Biology: Cytoplasm and Cytoskeletons
[Free Registration/Login may be required to access all resource tools.] Discusses the roles of the cytoplasm and cytoskeleton.
BiologyWise
Biology Wise: Plant Cell Structure and Parts
Describes plant cells and the structure and function of their different parts.