This demonstration results in the isolation of DNA from banana. It is very useful for students to see DNA to bring some sense of physical reality to what can be a very abstract topic.
Categories: Teacher Demonstration
The distinction between diffusion and osmosis is not clear to many students. Observing coloured particles (such as food dye) diffuse in water shows direct evidence of diffusion, but the movement of... read more
Prior to Thomson’s work it was thought that the atoms of each element were unique, invisible particles, or that atoms were made of subatomic particles that had significant mass compared to the atom... read more