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The phospholipid forms a bilayer (two layers).
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What molecules form the double layer of cell membranes?
A double layer of phospholipids makes up most of your cell membranes
Which two kinds of molecules combine to form cell membranes?
A phosphate group and a lipid combine to from the phospholipid bilayer (cell membrane).
What is the name of the phospholipid bilayer that surrounds the cell?
Lipid bilayer is composed of two layers of fat cells organized in two sheets. It is typically about five nanometers thick and surrounds all cells providing the cell membrane structure.
Describe a form of active transport similar to the work of carrier proteins?
Molecules are moved through the cell membrane by active transport.
What would happen if cholesterol is removed from the cell membrane?
without cholesterol, cell membranes would be too fluid, not firm enough and too permeable to some molecules , in other words it keep the membrane form turning to mush
Two layers of these form much of the cell membrane?
phospholipids
What molecules form much of the cell membrane?
The cell membrane is composed mainly of lipids. Phospholipids to be precise.
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.
What is a phospholipid bilayer and where would you find it?
Phospholipids are polymers made up of two fatty acids, glycerol, a phosphate group and a polar molecule. A cell's membrane consists phospholipids where they form two layers (with the polar molecules facing opposite ends) to separate the interior of the cell from the outside environment. This is called a phospholipid bilayer.
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
What in a cell membrane allow materials to enter and exit the cell?
Glycoproteins form channels which sustrates and larger molecules can pass through.
What is the important function of the phospholipids in the cell membrane?
They make up the plasma membrane and provide flexibility and protection to the plasma membrane. They also form a semi-permeable membrane, therefore making it easy for water to go in an out (osmosis).
Is enewrgy required for the movement of water molecules across the cell membrane?
No. Osmosis is a form of passive transport.
What molecules form the double layer of cell membranes?
A double layer of phospholipids makes up most of your cell membranes
What is aquaporins?
Aquaporins are protein molecules embedded in the phospholipid bilayer (cell membrane ) of some cells. They transport water across the cell membrane.
Molecules that form much of the cell membrane?
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
Does the plasma membrane of a living cell form an impenetrable barrier between the internal millieu and the environment?
No, the plasma membrane is a selectively permeable barrier that regulates the flow of most molecules across the membrane. The plasma membrane allows waste products to exit the cell and nutrients to enter the cell.
