LONG ESSAY QUESTIONS Plasma membranes are semipermeable membranes that allow sub

Question

LONG ESSAY QUESTIONS

Plasma membranes are semipermeable membranes that allow substances to enter and exit based on their chemical make up in relation to the membrane. Explain the composition of a plasma membrane and how it uses active transport, passive transport and bulk transport to move substances in and out of the cell. In your explanation be sure to include the following:

1) What makes up a plasma membrane (Include proteins!)

2) The polarity of the monomer in the membrane

Discuss head vs. tails

3) What is passive transport? What is active transport?

Discuss concentration gradient and energy use

4) Explain how simple diffusion, facilitated diffusion and osmosis work (discuss concentration gradient and energy use)

5) Explain how active transport works (discuss concentration gradient and energy use)

6) Explain the terms endocytosis, exocytosis, phagocytosis and pinocytosis

7) Give an example of what material is moved during each of these: simple diffusion, facilitated diffusion, osmosis, active transport, phagocytosis and pinocytosis

Explanation / Answer

So many question let me answer for what i can do best

A. various theories has been given for but according to fluid mosaic plasma memebrane is   two-dimensional liquid of lipid and protein molecules diffuse more or less easily where lipid are bilayers form the basis of the membranes, the plasma membrane also contains a large quantity of proteins, which provide more structure.

2. Plasma membrane surface is composed of apical membrane of a polarized cell faces inward to the lumen. The cell membrane have a thin layer of amphipathic phospholipids that is hydrophobic "tail" regions isolated from the surrounding water while the hydrophilic "head" regions interact with the intracellular (cytosolic) and extracellular faces of the resulting bilayer.

3. Active and passive transport both are biological processes that move oxygen, water and nutrients into cells and remove waste products. Active transport requires energy for the movement of biochemicals from areas of lower concentration to areas of higher concentration. On the other hand, passive trasport moves biochemicals from areas of high concentration to areas of low concentration; so it does not require energy.

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