"Below are some great YouTube channels for science. If you are a science teacher and you need some useful resources where you can search for and find educational science videos, then the list below would be of great help. Some of the channels listed below have thousands of subscribers featuring some of the best science videos online."
simple, easy to understand biology animations covering many topics such as hydrogen bonding between water molecules, the fluidity of the cell membrane, protein folding, channels used in membrane transport (gated versus non-gated), motor proteins, and much more
"MIT+K12 is an initiative of the Massachusetts Institute of Technology to harness the creativity of MIT's most outstanding asset -- its students -- in bringing excitement and understanding of science, technology, engineering, and math to kids."