Cellular membrane

What is the cellular membrane?

- Semi-permeable allowing for movement - Barrier surrounding cell and organelles - The fluid mosaic model proposes a structure where the lipid bilayer with protein allow a high degree of movement to the membrane

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What is the function of the cellular membrane?

to protect cell from surroundings - Control movement of substances in and out of the cells and organelles

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What is the role of fats and lipids in the cellular membrane?

- Phospholipid forms a semipermeable bilayer (main component of membrane) - Molecules that dissolve in fat can pass but other molecules cannot - Sterols such as cholesterol, maintain membrane integrity regarding temperature changes

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Affect of temperature on cellular membrane?

- Increased temperature: cholesterol attracts phospholipids preventing expansion - Decreased temperature: cholesterol prevents over packing (rigid structure)

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Name 3 types of protein?

Channel protein, integral protein and peripheral protein

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What is the role of proteins in the cellular membrane?

- Transport substrates through channels - Enzymes as they speed up the rate of reaction - Receptors regarding cell messaging and hormones - Structural integrity of membrane as protein receptors attach to protein strands in extracellular fluid

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What is the role of proteins in the cellular membrane?

- Glycolipids attach to fats and glycoproteins attach to protein (extracellular fluid) - Identifies cell with cell name tags or antigens

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Cellular membrane

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