University of Arizona
Prokaryotes, Eukaryotes, & Viruses
This tutorial compares prokaryotic and eukaryotic cellular organization and contrasts cells with viruses. Includes a practice quiz to test your knowledge.
Biology 4 kids
Biology4 Kids: Microfilaments Stringy Proteins
A short, informational text piece which explains the structure and function of microfilaments inside a cell.
Khan Academy
Khan Academy: Cell Cell Junctions
Learn about the different types of intercellular junctions, including plasmodesmata, tight junctions, gap junctions, and desmosomes.
Sophia Learning
Sophia: Cytoskeleton: Lesson 3
This lesson will discuss the structure and function of the cytoskeleton. It is 3 of 4 in the series titled "Cytoskeleton."
CK-12 Foundation
Ck 12: Life Science: 2.7 Organelles
Discover the organelles of a cell, and how their structure contributes to the cell's function.
Biology 4 kids
Biology4 Kids: Microtubules Thick Protein Tubes
A short, informational article which explains the structure and function of microtubules inside a cell.
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.
Cells Alive
Cells Alive:organelle Crossword #2
A crossword to help review the terms and definitions associated with organelles.