BIOLOGY 1A03 Lecture Notes - Lecture 4: Atp Hydrolysis, Osmosis, Active Transport

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BIOLOGY 1A03 Full Course Notes
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BIOLOGY 1A03 Full Course Notes
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Due to their amphipathic nature, phospholipids form unique structures that are critically important for the cell. Water molecules interact with the head regions, but not the tails of phospholipids. As a result, tails will interact with tails to form hydrophobic cores and the hydrophilic heads interact with water in the extracellular or intracellular environment. In addition to forming lipid bilayers that surround the cell and make up the membranes of various cell organelles, phospholipids can aggregate and form lipid micelles. These kinds of structures become important for absorption of fat-soluble vitamins and complex lipids in the human body. What is remarkable is that these lipid aggregates form spontaneously, without the use of any energy. If we look in closer detail at the cell membrane, what we nd is that phospholipids are not stationary because membranes are uid. In other words they can move laterally within one layer of the lipid bilayer that is, they can move left/right, forward/backward.

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