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Module 1: Paso a través de membranas

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Estructura y función de las membranas

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XSIQ
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Biology - Structure and Function of Membranes

Structure and Function of Membranes

A membrane is any thin layer. In living things," membrane" usually refers
to the plasma membrane of cells. Membranes enclose cells, surround most
intra _(within)_ cellular organelles [1] in the cytoplasm, and have
receptors (carbohydrate and protein molecules) on the outer surface which
recognise other molecules and control the passage of materials. The fluid
mosaic model of the structure of membranes is shown below.

The phospholipid molecules have tails - the or water-repelling end and the
or water-loving end. The membrane's impermeability to water-soluble
molecules is due to this bilayer.

Structure of cell membrane and cell organelle membranes

The cell membrane: different molecules cross it in different ways

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[1] http://alison.com/#