molecular & cellular biology

The videos below explain current scientific theories regarding –
the emergence of molecular and cellular mechanisms supporting life:

For brief introductions,
I highly recommend the Stated Clearly Videos:

For more detailed tutorials,
I highly recommend the Crash Course series, specifically their:
‘Biology’ playlist. (especially episodes 1-20, after that they get into specific organs and organisms)

Interesting insights into molecular/cellular biology from others:

or full version with tags identifying structures: