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by TeMPOraL
2975 days ago
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Where "flying around" means "constantly bumping into everything else". This means small stuff doesn't just fly around the cell, it has to diffuse through it. A nice side effect is that eventually, everything gets into contact with everything else. That, as I understand, is how small molecules get to their right place. Also, this means that it's too tight for large stuff to move around at all. Hence the specialized machinery within the cell that transports large molecules. Source for both: I'm 1/3d of th way through The Machinery of Life[0]. Incidentally, I learned about this book from HN. It's absolutely amazing. The biggest selling point are the drawings - David S. Goodsell created a lot of illustrations (like these[1]) that give you a good perspective on how stuff is packed within cells. EDIT: that blog post you linked covers the diffusion aspect well, I second the recommendation to read it. -- [0] - https://www.goodreads.com/book/show/6601267-the-machinery-of... [1] - http://mgl.scripps.edu/people/goodsell/illustration/public |
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