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 How Big is a...

The head of a pin is about 2mm in diameter. Use this animation to compare the relative sizes of cells and organisms sitting on a pinhead. Nearly invisible without magnification, dust mites dwarf pollen grains and human cells. In turn, bacteria and viruses are even smaller.

Cells Alive

 Plant, Animal and Bacteria Models

Interactive.  Click on the cell part for a description.

Cells Alive
Vessicle Budding and Fusing

A great animation that explores these processes in a eukaryotic cell.

The Inner Life of a Cell

Movie from Harvard University showing what happens inside of a cell
The Virtual Cell

Click to get a description of each cell part
Interactive Mitosis Tutorial

See cell division in Eukaryotic Cells
ExCELL at Cells

Basic information about cells
Cells are the Starting Point

Basic information about cells
Cellular Transport

Interactive annimations
Cell Structure and Function Quiz
Basic Cell Structures, Functions, and Processes


Students can test their knowledge of the functions of various cell organelles in a eukaryotic cell.

Virtual Labs

for General Biology 101
Cell Structures

Great animated activities that explore the structure of plant cells, animal cells, and prokaryotic cells.


An amazing multimedia tutorial on cells and cell processes. The site is fully narrated and features lots of animated visual demonstrations! Requires the Flash plugin.

Comparison of Plant and Animal Cells

Great hyperlinked illustrations with descriptions of every organelle!

Biology of Cancer

11 minute documentary shows how cancer begins with the breaking of a single cells

 Virtual Cell Animation Collection

Regulated Transcription
Insulin Signaling
Protein Recycling
Consecutive Secretion
Regulated Secretion
Protein Modification
Protein Trafficking
Photosystem II
Protein Transport
Cellular Respiration
mRNA Processing
mRNA Splicing
Lac Operon