How Does The Term Fluid Mosaic Describe The Structure Of The Plasma Membrane?

How Does The Term Fluid Mosaic Describe The Structure Of The Plasma Membrane?

Length: 1557 words (4.4 double-spaced pages)

Rating: Better Essays

Open Document

Essay Preview

Essay Quiz
1. How does the term fluid mosaic describe the structure of the plasma membrane?
Let’s find out first what it is plasma membrane and its function. The plasma membrane is the boundary between the cell and its environment. It regulates what enters and exits the cell. Plasma membrane plays a vital role in protecting the integrity of the interior of the cell by allowing only selected substances into the cell and keeping other substances out. It also serves as a base of attachment for the cytoskeleton in some organisms and the cell wall in others. Thus the cell membrane supports the cell and helps in maintaining the shape of the cell. The cell membrane is primarily composed of proteins and lipids. While lipids help to give membranes their flexibility and proteins monitor and maintain the cell 's chemical climate and assist in the transfer of molecules across the membrane.
(“Plasma Membrane,” 2016).
Consequently, Scientists use the fluid mosaic model to describe the organization of phospholipids and proteins. Proteins and phospholipids make up most of the membrane structure. According to Bailey (2016) Phospholipids form a lipid bilayer in which their hydrophilic head areas spontaneously arrange to face the aqueous cytosol and the extracellular fluid, while their hydrophobic tail areas face away from the cytosol and extracellular fluid. The lipid bilayer is semi-permeable, allowing only certain molecules to diffuse across the membrane to enter or exit the cell. On the other hand, membrane proteins are free to move within the lipid bilayer as a result of its fluidity. Although this is true for most proteins, they can also be confined to certain areas of the bilayer with enzymes. Membrane proteins perform various functions, and ...


... middle of paper ...


... the cell. The membrane proteins are very specific. One protein that moves glucose will not move calcium (Ca) ions. There are hundreds of types of these membrane proteins in the many cells of your body (“Active Transport,” 1997-2015).
Endocytosis and Exocytosis play an important role in this process. Endocytosis is a general term for the process whereby very large particles of material are wrapped with plasma membrane and moved into the cell in the form of vesicles or vacuoles. None of the trapped material actually moves through the membrane, but remains on the other side of the original membrane, even while the vacuole is inside the cell. Exocytosis is the export of large quantities of material from the cell. Vesicles containing the material to be exported fuse with the plasma membrane, dumping the contents into the environment around the cell (Simon, 2015, pg. 51).

Need Writing Help?

Get feedback on grammar, clarity, concision and logic instantly.

Check your paper »

Investigate the Effect of Temperature on Cell Membranes and Membrane Structure

- Investigate the Effect of Temperature on Cell Membranes and Membrane Structure If you read a recipe for cooked beetroot it will usually recommend that you don’t remove the outer skin of the beetroot and don’t cut off al the stalk and root if you want to avoid getting lots of red dye in the cooking water. Beetroot contains red pigments called betalains, located within the cell vacuole. Normally the pigments can’t pass through membranes but they leak out when the beetroot is cooked. Aim – The aim of this practical is to use beetroot to examine the effect of the temperature on cell membranes and relate the effects observed to membrane structure....   [tags: Biology Chemistry Science Experiment Essays]

Better Essays
1907 words (5.4 pages)

The And The Mosaic Model Essay

- Once upon a time there was a little guy walking down the road of Cell city. His name was Bob and he was a fluid mosaic model. He decided to walk to the coffee shop one day but then as soon as he walked in, he heard yelling and screaming. He turned around and saw everyone running for their life. Everyone was yelling, “run, run, it’s going to hit you!” He started running too and was just about to ask someone what’s happening when he turned around and saw a big flood coming towards them. The mosaic model wasn’t aware of what was going on and his adrenaline rush seemed like it wasn’t functioning, so he got caught in the flood and couldn’t breathe and fainted....   [tags: Cell membrane, Protein, Ion channel, Phospholipid]

Better Essays
1579 words (4.5 pages)

Osmosis Through A Semi Permeable Membrane Using Dialysis Bags Essay

- In this experiment we took dialysis bags and filled them with various sucrose solutions and put them in water over a period of about 90 minutes to look at the osmosis in each bag and the tonicity of each environment the bags were in. We also took potato pieces and submerged them into various sucrose solutions to determine the ideal state of tonicity for plants and the osmosis that occurred over a period of time. The final results for the first exercise was that 0.8M sucrose solution gained the most mass and that it was hypertonic to its environment....   [tags: Osmosis, Semipermeable membrane, Diffusion]

Better Essays
2246 words (6.4 pages)

Essay on The Volume Flow Rate Of A Fluid

-   The volume flow rate of a fluid is the amount of fluid that passes a point per second. It is dependent on a number of variables. These variables include the dimensions of the object that the fluid is flowing through, and the amount of force that is applied to it. The pressure that water in a pipe system is under is calculated using the following equation: P=F/A Where P is the pressure, F is the force that is being applied to the water, and A is the area that the water is in. The force in the previous equation can be calculated using Newton’s Second Law of Motion, F=ma (University of Tennessee, 2014)....   [tags: Fluid dynamics, Viscosity, Fluid]

Better Essays
1921 words (5.5 pages)

Essay about The Membrane Of The Cell Membrane

- Cells are living things that requires substances to be imported into the cell for growth and repair just as a human, or animal, needs to eat for growth and repair. Unlike the human or animal that has arms, jaws, or external tools to collect and consume food, the basic cell does not have any external appendages to readily obtain the substances it needs. This does not leave the cell without any way to obtain the required substances, obviously otherwise they would all be very short lived, and the ways they obtain substances differ in the required energy and the substance being obtained....   [tags: Cell membrane, Cell, Lipid bilayer]

Better Essays
730 words (2.1 pages)

Essay The Functions of Erythrocyte Membrane

- The erythrocyte membrane has many functions, the first of which is to serve as an impenetrable fluid barrier which separates the inside contents of the cell from the plasma. The membrane allows it to transport O2 and CO2 by maximizing the ratio of surface area to volume with its biconcave disc shape. The membrane is also strong and is constantly going through shape and metabolic changes and has a tensile or lateral strength that is greater than that of steal. The membrane is also more elastic than a comparative latex membrane, this strength and elasticity allows for deformability (Solberg, 2013)....   [tags: cell membrane, red blood cells, cholesterol]

Better Essays
1031 words (2.9 pages)

Essay on Cells And The Cell Membrane

- Despite the fact that there is still plenty to ascertain about cells, what is known so far has had an extensive impression on a multitude of scientific fields. The analysis of cells has even assisted in the investigation to more effectively understand cancer. Cells are essentially the building blocks of life. As a matter of fact, all organisms varying from the minuscule and simple organisms to the gigantic and sophisticated organisms are made up of cells. Truly, something that is noteworthy about cells is that although they are so small they have even smaller organelles with many important functions within them....   [tags: Cell wall, Cell, Cell membrane, Bacteria]

Better Essays
1577 words (4.5 pages)

The Effect Of Intracellular Fluids On The Cell Membrane Essay

- Human cells are partially made up of liquids that are both inside and outside of our cells. The water inside the cell is called intracellular fluid (ICF) and makes up about 42% of the total body weight. On the other hand, extracellular fluids (ECF) usually denote all body fluid outside of the cells. In order to define which area the fluids are based, they are determined by its location to the cell membrane. For instance, if the fluids are found to be on the outside of the cell membrane, it would signify that we are viewing ECF....   [tags: Blood, Potassium, Cell membrane, Glucose]

Better Essays
722 words (2.1 pages)

The Effects of Varying, Extreme Temperatures and Varying Organic Solvents on a Beet Root Cell Membrane

- ... This can be explained because it is the longest chained alcohol when compared to the others that were used in the experiment (Bio. Sciences Dept., 2013). It is theorized that the cell membrane is significantly reformed following the attachment of the 2-propanol to the membrane phospholipids. (Wanderlingh et al., 2010). This change in the membrane could be related to the high amount of leakage recorded by the spectrophotometer, as these changes could rupture the plasma membrane if a sufficient amount of the alcohol is present (Wanderlingh et al., 2010)....   [tags: molecules, hydrophilic, membrane]

Free Essays
548 words (1.6 pages)

The Effect Of Permeability On The Membrane Using Chemicals And Beta Vulgaris ( Beetroot )

- ‘The affect of permeability in the membrane using chemicals and Beta Vulgaris (beetroot)’ Introduction: All cells are surrounded by a cell membrane, which has a semi-permeable phospholipid bilayer (Mitchell, 2015, Flinders University). A membrane is comprised of lipids, proteins and carbohydrates (Mitchell, 2015, Flinders University). Membrane permeability is determined by the structure of the membrane, meaning some larger substances will not pass through the membrane (Flinders University, 2015, p.36)....   [tags: Cell membrane, Lipid bilayer, Chemistry, Beet]

Better Essays
931 words (2.7 pages)