what the is function of the cell membrane of a cell LAB 4 CELL MEMBRANE STRUCTUR
ID: 193274 • Letter: W
Question
what the is function of the cell membrane of a cell LAB 4 CELL MEMBRANE STRUCTURE AND FUNCTION PRE-LAB ASSIGNMENT 1. Read Lab 4 and the corresponding textbook chapter listed in the syllabus 2. What is the function of the cell membrane of a cell? 3. Why do phospholipids automatically form a double layer of molecules ("phospholipid bilayer") when placed in water? Explain the parts of the molecule and how they interact with water 4. Why do some molecules pass more easily through the phospholipid bilayer than others? How do particles that have difficulty moving through the phospholipid bilayer get through the cell membrane? 5. 6. What is the difference between passive and active transport? 7. Describe the 3-dimensional fluid mosaic model of cell membrane structure 8. Explain how different types of stressors may affect the cell membrane. How does a colorimeter measurement give an indication of the amount of damage done to a beet cell membrane? 9. 75Explanation / Answer
Answer:
Cell Membrane : A Cell is a basic unit of life and enclosed by a thin semi-permeable membrane called Cell membrane or Plasma membrane. It surround the cell to create a barrier between cytosol and extracellutar matrix. It is primarly composed of Phospholipids, cholestrol, proteins & carbohydrates. The structure of plasma membrane resembles to Fluid mosaic model. Cell membrane consist largely of lipid bilayer which is a double layer of phosholipid, cholestrol & glycolipid (fatty acid chain). Lipids provides flexiblity & fluid character to the membrane and protiens maintain the cell chemical climate and transfer of molecule across the membrane.
Phospholipid are major component of cell membrane. The hydophilic heads and hydrophobic tails of the phospholipid molecule form the phospholipid bilayer of the cell membrane. Some protiens in membrane form open pores called memmbrane channels which are responsible for selective permeablity and allow free diffusion of ion into or out of the cell.
Functions of Cell membrane:
*Exocytosis : The process by which a cell move the content of secretory vesical out of the cell through cell membrane.
*Endocytosis : It is opposite process by which the content of secretory vesical are moved into the cell through cell membrane.
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