Yes, cells are extremely crowded and fast-moving inside. Molecules are moving at 250 miles per hour inside cells due to thermal motion, and a particular molecule collides with other molecules billions of times per second.
When you see an animation of a cell, it's puzzling how the right molecule shows up in the right place. But in reality, a typical enzyme collides with something to react with 500,000 times per second just from random motion.
When you see an animation of a cell, it's puzzling how the right molecule shows up in the right place. But in reality, a typical enzyme collides with something to react with 500,000 times per second just from random motion.
I wrote a blog post discussing this in more detail: http://www.righto.com/2011/07/cells-are-very-fast-and-crowde...