PLS 170C1 Lecture Notes - Lecture 4: The Plant Cell, Lipid Bilayer, Electron Microscope
14 Jan 2017
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Fuel: for cell metabolism (coh, fats) 9 essential amino acids: (tryptophan, methionine, valine, histidine, threonine, phenylalanine, leucine, isoleucine, and lysine), plants make these, but humans cannot. 13 vitamins: small molecules needed for enzyme function, plants can make them, but humans cannot. 17 essential mineral nutrients: ca p s k cl na mg, fe zn cu mn i co se cr mo f. Essential fatty acids: (omega-3 fatty acids e. g. linolenic acid) We depend on plants for all these needs! Cells are measured in micrometers; a unit of measure in the metric system equal to one millionth of a meter. Typically, cells range from 10 to 100 micrometers in diameter. Light microscope reveals a small level of detail, but the electron microscope reveals a more re ned cell structure . Fatty lipid bilayer that retards passage of water and substances that dissolve in water. Proteins with speci c functions embedded in and on the surface of the lipid bilayer.
