Prokaryotic And Eukaryotic Cell Essay

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Introduction to Cell Biology – Unit 10193 – Chloe Barrett This essay discusses the difference in prokaryotic and eukaryotic cells, two types of specialised eukaryotic cell, and the relation of the structure of cell membranes to their function of moving substances in and out of cells.
Prokaryotic and Eukaryotic cells are two very different, but also very similar cells. There are many differences between them that can help to associate between each one. Eukaryotes are any organism that consists of one or more cells that have DNA in a membrane-bound nucleus.(, 2017) A eukaryotic cell is a large, more complex cell compared to a prokaryote. Inside a eukaryote, consists of many different organelles, all with vital roles to play
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A cell membrane consists of phospholipids. These are two fatty acid chains attached to a phosphate head. The phosphate head is hydrophilic (polar), which means it likes water, however, the tails are hydrophobic (non-polar) which means doesn't like water. The phospholipids either form a micelle or bilayer structure. In the structures, the heads face towards water whereas the tails face away from the water. The tails are non-polar, hydrophobic, this relates to the function because they act as a barrier, charged particles. (wiseGEEK, 2017) In the cell membrane, there are proteins. There are two types of proteins, intrinsic proteins which are all the way throughout the cell membrane, and the extrinsic proteins, which are on the inner or outer surface of the membrane. Intrinsic proteins are known as carrier proteins, these help certain substances pass through the membrane, specifically the ones that cannot do it alone, for example, charged ions. Extrinsic proteins are used for cell-signaling or cell recognition. Because the phospholipids are like a fluid, they stay in the structure but move around freely, and the proteins are dotted about, it is known as the fluid mosaic model. (, 2017) Also throughout the membrane is cholesterol. This plays a big part in controlling the membranes fluidity. The more cholesterol in the membrane, the less fluid, therefore the membrane is less permeable. (,

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