BIO 1140 Lecture Notes - Model Organism, Theodor Schwann, Drosophila Melanogaster
5 Sep 2013
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Lecture 1 - topic 1 (intro to cell biology) Enormous diversity, shapes can be very diverse, and also interns of size. 2nm) they can be as big as 13cm in diameter (eggs are an example) Slide 5-size of cells avg prokaryotic cell 1-5 microns avg eukaryotic 10-30 microns ribosome diameter-30nm nucleus diameter-0. 006mm (6 microns) mitochondrion length-3x10^-6 (3 microns) giraffe axon length-1x10^6. It is good as long assistances are small. cells cannot afford to be large because the rate of diffusion cannot keep up. diffusion is relatively slow, this is what keeps cells small. At a certain size, the synthetic machinery just simply cannot produce enough molecules, to produce a great enough concentration for reactions to proceed. Slide 7-prokaryotic and eukaryotic cells differ in their solutions to size problem. Genetic material of the cell is in the form of a single circular chromosome without structural proteins. All folded on itself and forms nucleiod (no nucleus)
