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the cell membrane is made of a phospholipid bilayer. (complicated way of saying two layers facing each other. each layer is made of long chains of carbons attached to a phosphate group:
see here for a good picture
http://en.wikipedia.org/wiki/File:Cell_membrane_detailed_diagram_4.svg
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∙ 12y ago
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∙ 14y agophospholipid
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What molecules form much of the cell membrane?
The cell membrane is composed mainly of lipids. Phospholipids to be precise.
The outer covering of an animal cell?
The outer covering of an animal cell is the cell membrane. The outer covering of plant cells is the cell wall, which is much stronger and stiff.
What cell membrane allows you to move in and out of a cell?
its is a permeable membrane which allows osmosis and diffusion of small molecules such as glucose, salts and mineral ions. In an animal cell, it cannot hold the cell turgid like plant cells can, and so it bursts when too much water has entered it. This is osmotic shock
Why do oxygen molecules easily diffuse across a cell membrane while protein molecules do not?
Cell membrane is semipermeable and oxygen molecules have size required for easy passqge while Glucose molecules do not have that size required for easy passage.
In the years since the proposal of the fluid mosaic model of the cell membrane what observations has been added to the model?
The concentration of protein molecules is now known to be much higher.
What molecules form much of the cell membrane?
The cell membrane is composed mainly of lipids. Phospholipids to be precise.
The outer covering of an animal cell?
The outer covering of an animal cell is the cell membrane. The outer covering of plant cells is the cell wall, which is much stronger and stiff.
Two layers of these form much of the cell membrane?
phospholipids
How much glycoproteins are in the cell membrane?
there are 2% of the molecules in plasma membrane and 50% of its weight these are the protins in the animal cells.
What cell membrane allows you to move in and out of a cell?
its is a permeable membrane which allows osmosis and diffusion of small molecules such as glucose, salts and mineral ions. In an animal cell, it cannot hold the cell turgid like plant cells can, and so it bursts when too much water has entered it. This is osmotic shock
2 layers of these form much of the cell membrane?
A double layer, known as a bilayer, of phopholipids forms the main part of the cell membrane.
Why do oxygen molecules easily diffuse across a cell membrane while protein molecules do not?
Cell membrane is semipermeable and oxygen molecules have size required for easy passqge while Glucose molecules do not have that size required for easy passage.
Do nucleic acids form much of the cell membrane?
No, in fact most of the cell membrane consist of phospholipids and proteins. Integral proteins are mostly used for transport and other functions and the phospholipids which have a polar phosphate head and nonpolar lipid (fat) tails.
What gives a cell form?
If you are referring to a cell as in a biological cell.. animal cells are shaped by their cell membrane. They don't really have a set shape exactly, because the membrane is made up of flexible lipids. plant cells are more structured, in addition to a cell membrane, they have a cell wall. This much more rigid then the membrane. If you were looking for different information,. I hope you find out :)
In a cell what separte's the inside from the outside?
when phospholipids are arranged in a way that polar heads can be closest to water molecules and the nonpolar molecues tails can be found away from the water molecules. when phospholipid molecules come toghether in this way a barrier is created that is polar at that surface and non polar in the middle. Water substances will not move easily through the plasma because they are stopped by the non polar middle. Therefore, the plasma membarane can separate the enovironmet insde the cell from the environment outside the cell.
What is the purpose of the cell membrane.?
The cell membrane regulates the passage of chemicals in or out of the cell. It is made up of a phospholipid Bi-layer consisting of many lipids much like the ones found in a detergent (Hydrophillic heads and hydrophobic tails). The tails avoid water and stay together - this makes a water proof barrier. A cell membrane is known as partially permeable as it allows non-polar molecules (or very small polar molecules such as CO2) to pass through but stops larger polar molecules, H2O for example, from passing, this is useful as it prevents excessive water loss from the cell. The cell membrane is more detailed but for your question there is no need for that.
What is the out cell membrane do in a plant cell?
it is not call ed the outer membrane, its the cell wall. It does the same thing like the cell membrane, but the cell wall is much for stricter with objects coming in and out of cell, what is call, selectivly permeable
