Biology Chapter 4

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Robert Hooke


Light Microscope


Anton van Leeuwenhoek


Cell Theory


Plasma Membrane

The plasma membrane is a selectively permeable phospholipid bilayer that is made up of phospholipids which have a polar phosphate head and a non-polar lipid tail. The head is hydrophilic (water-loving) while the tail is hydrophobic (water-fearing). The plasma membrane is also called the cell membrane. It also has cholesterols in it that keep the membrane firm but keep it from freezing in cold weather. The plasma membrane also has carbohydrates, proteins, and enzymes in it that serve various purposes. It can also be described as a fluid mosaic model








The jelly-like liquid inside the nucleus.

















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