It's important to think about the relative sizes within biology
because often we'll see our cells spending time
at such a small level, such a microscopic level,
it becomes hard to relate it to what we're learning.
So atoms are super super tiny.
There's no way we can see those with naked eye.
We cannot even see it under a light microscope.
Even when we put sixty or so atoms together,
we still cannot see that under a light microscope.
And even if we look at the macromolecules,
which is a lot of what we're going to be spending this course on,
we still cannot see those.
It's not until we start looking at mitochondria and bacteria that
we can start even seeing those things under a light microscope.
Above the level of bacteria, we can see red blood cells.
They're not that much bigger because they don't have
many of the components inside them that most of our cells have.
But when we get up to the level of our animal cells or plant cells,
we can see that there is much more complexity in them.
Some of which, you can even see under a light microscope.
It's not until we get up to the level of a frog egg
that we could even see this with a naked eye.