Is The Phospholipid Bilayer Hydrophobic
ii.v: Phospholipid Bilayers
- Folio ID
- 6441
All cells have a plasma membrane. This membrane surrounds the cell. And then what is its role?
Can molecules enter and leave the prison cell? Yes. Can annihilation or everything enter or leave? No. And so, what determines what can go in or out? Is information technology the nucleus? The Dna? Or the plasma membrane?
The Plasma Membrane
The plasma membrane (also known as the cell membrane) forms a bulwark between the cytoplasm inside the cell and the environment exterior the jail cell. Information technology protects and supports the cell and too controls everything that enters and leaves the cell. Information technology allows only certain substances to pass through, while keeping others in or out. The ability to allow only certain molecules in or out of the cell is referred to as selective permeability or semipermeability. To understand how the plasma membrane controls what crosses into or out of the cell, you need to know its composition.
The plasma membrane is discussed at http://world wide web.youtube.com/sentinel?5=-aSfoB8Cmic (6:sixteen).
A Phospholipid Bilayer
The plasma membrane is equanimous mainly of phospholipids, which consist of fatty acids and alcohol. The phospholipids in the plasma membrane are bundled in two layers, chosen aphospholipid bilayer. As shown in Effigy beneath, each phospholipid molecule has a head and 2 tails. The head "loves" water (hydrophilic) and the tails "hate" water (hydrophobic). The h2o-hating tails are on the interior of the membrane, whereas the water-loving heads betoken outwards, toward either the cytoplasm or the fluid that surrounds the cell.
Molecules that are hydrophobic tin can easily pass through the plasma membrane, if they are minor plenty, because they are h2o-hating like the interior of the membrane. Molecules that are hydrophilic, on the other hand, cannot pass through the plasma membrane—at least non without aid—because they are water-loving similar the exterior of the membrane, and are therefore excluded from the interior of the membrane.
Phospholipid Bilayer. The phospholipid bilayer consists of two layers of phospholipids, with a hydrophobic, or h2o-hating, interior and a hydrophilic, or water-loving, exterior. The hydrophilic (polar) head group and hydrophobic tails (fatty acid chains) are depicted in the single phospholipid molecule. The polar head grouping and fatty acid chains are attached by a three-carbon glycerol unit.
See Insights into cell membranes via dish detergent at http://ed.ted.com/lessons/insights-into-cell-membranes-via-dish-detergent-ethan-perlstein for additional information on the cell membrane.
Summary
- The plasma membrane forms a barrier betwixt the cytoplasm and the environment outside the prison cell. The plasma membrane has selective permeability.
- The plasma membrane is primarily equanimous of phospholipids bundled in a bilayer, with the hydrophobic tails on the interior of the membrane, and the hydrophilic heads pointing outwards.
Explore More
Use these resources to answer the questions that follow.
Explore More than 2
- Cell Membranes at http://johnkyrk.com/cellmembrane.html.
- Are all cells surrounded by a membrane?
- Why are phospholipids considered an amphipathic molecule?
- What is a glycolipid?
- Describe the role of cholesterol in the cell membrane.
Explore More 3
- http://www.hippocampus.org/Biology → Non-Majors Biological science → Search: Plasma Membrane Structure
- What are the roles of the plasma membrane?
- What are the functions of proteins associated with the cell membrane?
- Why is the structure of the cell membrane described as "fluid mosaic"?
Review
- Depict the function of the plasma membrane.
- What is meant by semipermeability?
- Describe the composition of the plasma membrane.
- Explain why hydrophobic molecules can hands cross the plasma membrane, while hydrophilic molecules cannot.
Is The Phospholipid Bilayer Hydrophobic,
Source: https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Book:_Introductory_Biology_%28CK-12%29/02:_Cell_Biology/2.05:_Phospholipid_Bilayers
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