Bacteria are basically cells. But did you know that we carry around 3 to 5 pounds of bacteria on our body. That much bacteria means, the number of bacteria we carry on our body actually vastly outnumber the number of cells we have in our body. Still, these bacteria only make up 3% of our entire body mass. That’s because, bacteria are way smaller than our cells...more interesting facts
This video begins with a simple geometry problem and ends with a discussion of Allen's Rule and reasoning for the microscopic nature of cells.
Why are cells small?
The microscopic internal structures within a human cell are shown in this 3D, computer-generated animation.
With amazing tools that peer deep into cells, cell biologists are beginning to understand the structure, function and history of these highly organized, complex, chemical factories that are the building blocks of life. Voyage into the microscopic world of prokaryotic, eukaryotic cells, chloroplasts, and mitochondria.
A short animated movie showing the inner life inside a human cell.
This animation by Nucleus shows you the function of plant and animal cells for middle school and high school biology, including organelles like the nucleus, nucleolus, DNA (chromosomes), ribosomes, mitochondria, etc. Also included are ATP molecules, cytoskeleton, cytoplasm, microtubules, proteins, chloroplasts, chlorophyll, cell walls, cell membrane, cilia, flagellae, etc.