Bio I 1 Q 5 - proteins, and glycocalyx. The phospholipid...

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Section I Exam Question 5 Plasma membranes have a very important part in eukaryotic cells because they are protectors of the nucleus. The eukaryotic cells contain a great number of compartments. The plasma membranes are flexible chemically active outer lining of a cell that interacts with the world outside the cells. Plasma membranes provide structural support stabilizes various parts of the cell. It also acts as security for the nucleus and only allows the proper molecules to enter through. It is important to have functioning membranes to protect the nucleus. If you have defective membranes they will not regulate the molecules that enter and diseases are sure to destroy the cells. Plasma membranes are made up of four major parts the phospholipid bilayer, cholesterol,
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Unformatted text preview: proteins, and glycocalyx. The phospholipid bilayer is the main component and makes it fluid in nature. It also has two hydrophobic lawyers and the only other substances that can pass through are small molecules and other hydrophobic substances. The cholesterol acts as a patching substance thus keeping some small molecules from entering, and maintaining a level of fluidity. There are two types of proteins that are embedded within the phospholipid bilayer, integral and peripheral. The two proteins provide support, recognition, communication and transporting of molecules. Glycocalyx is the forth part of the plasma membrane it serves as an lubricate and an adhesion lawyer....
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