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The Importance of Biological Molecules I will discuss the importance of biological molecules, and in the interest of brevity I will limit this to carbohydrates, lipids and protein. Lipids basically are the "bag" around the cell structure, proteins are the mechanics to control cellular processes, and the carbohydrates are the cell's energy source. A plasma membrane primarily consists of lipids in terms of molecules, but also protein and carbohydrates. This is because of a lipid's biological properties. A lipid has a hydrophilic head and a hydrophobic tail, thus forms a bilayer. The lipids line up tails inwards and heads out. The phospholipid bilayer is a barrier keeping the contents inside a cell or "vesicle", but also water out of the cell. "This phospholipids bilayer is studded with proteins, polysaccharides and other lipids. It is described as a fluid mosaic model." Although water and the water-soluble molecules can not usually pass through a lipid membrane,...

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