Chapter 5- Biological Membranes Why is a cell\'s plasma membrane important? (thi

Question

Chapter 5- Biological Membranes Why is a cell's plasma membrane important? (think about what the major purpose is of the plasma membrane. -Describe plasma membrane composition (What types of lipids and proteins are present? How do the proteins associate with the membrane?) -What factors affect membrane "fluidity"? Describe the functions of membrane proteins (proteins that are found at the membrane) What types of molecules can easily pass plasma membranes? Which one cannot? What are the differences between passive vs active diffusion How is water balance affected in animal vs plant cell (i.e. describe hypotonic, hypertonic, isotonic conditions in these two cell types)? -Describe exocytosis vs endocytosis (phagocytosis, pinocytosis, receptor mediated- endocytosis) in cells

Explanation / Answer

Answer:

a) Plasma membrane is important because it regulates the movement of substances inside and outside of the cell. It acts as a selectively permeable membrane that seperates the inside components of the cell from its surroundings.

b) The plasma membrane is made up of both lipids and proteins. The lipids consists mainly of phospholipid bilayer which forms a stable barrier between two aqueous compartments. The plasma membrane of animal cells also contain glycolipids and cholesterol. In terms of proteins the membranes have both peripheral (Which are loosely bound to one of the leaflet of the bilayer) and integral (which span accross the bilayer like transmembrane) membrabne proteins.

c) The following factors can affect the membrane fluidity: 1.

d) The functions of membrane proteins are as follows:

  

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