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.
Estrella Mountain Community College
Estrella Mountain Community College: Cell Organization
Description of organelles. Links will take you to a glossary with pictures for many of the definitions. Ends with a quiz linked to answers.
Tree of Life Project
Tree of Life Web Project: Flagellates
Very good, in-depth overview of flagellates. Includes a chart listing all the groups of flagellates.
University of Hamburg
University of Hamburg: Microtubules
Discussion of the size and structure of the microtubules in a cell. Links within the text take students to images and schematics.
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.
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.
Other
Nexperion: Filament Systems
Get a microscopic look at the filament system through special probes and instrumentation. Site shows pictures of the actin fil-a-ments, inter-me-di-ate fil-a-ments, and micro-tubules using the special probes.
BiologyWise
Biology Wise: Centriole Functions
Describes the structure and functions of centrioles within a cell.