Why do the phospholipids in the cell membrane form a bilayer?

Being cylindrical, phospholipid molecules spontaneously form bilayers in aqueous environments. In this energetically most-favorable arrangement, the hydrophilic heads face the water at each surface of the bilayer, and the hydrophobic tails are shielded from the water in the interior.
A.

Why would they make poor receptors?

To bind the receptor causes a response beyond the cell membrane and the enzyme facilitates a chemical change in the substrate. If proteins were rigid, they would make poor receptors because the proteins has to have a certain shape and molecule to bond to. Insulin helps cells take up sugar from the blood.
  • Why do you use saline solution instead of water?

    When a person becomes dehydrated due to the loss of fluids and solutes, saline solution (water and salts) is infused into the bloodstream by medical personnel. Why is saline solution used instead of pure water? Pure water would be hypotonic relative to the contents of blood cells and could cause the cells to burst.
  • How does a sieve demonstrate the property of selectively permeable?

    A cell organelle that releases energy from stored food molecules. Why do phospholipids form a bilayer in the cell membrane? How does a sieve/colander demonstrate the property of selective permeability? active transport requires energy requiring movement of molecules across a membrane from lower to higher concentration.
  • Are phospholipids hydrophilic or hydrophobic?

    Phospholipids are amphipathic molecules. This means that they have a hydrophilic, polar phosphate head and two hydrophobic fatty acid tails. These components of the phospholipids cause them to orientate themselves, so the phosphate head can interact with water and the fatty acid tails can't, hence forming a bilayer.
B.

What happens when your insulin receptors stop working?

Insulin helps cells take up sugar from the blood. Explain the effect on blood sugar levels if insulin receptors stopped working. Saline solution is used because there would be more solutes in the cell if plain water was used, so water would go into the cell and cause the cell to rupture.
  • What happens when your insulin receptors stop working?

    Insulin helps cells take up sugar from the blood. Explain the effect on blood sugar levels if insulin receptors stopped working. Saline solution is used because there would be more solutes in the cell if plain water was used, so water would go into the cell and cause the cell to rupture.
  • What is the role of the cell membrane?

    It consists of a lipid bilayer with embedded proteins. The basic function of the cell membrane is to protect the cell from its surroundings. The cell membrane controls the movement of substances in and out of cells and organelles. In this way, it is selectively permeable to ions and organic molecules.
  • Why do you use saline solution instead of water?

    When a person becomes dehydrated due to the loss of fluids and solutes, saline solution (water and salts) is infused into the bloodstream by medical personnel. Why is saline solution used instead of pure water? Pure water would be hypotonic relative to the contents of blood cells and could cause the cells to burst.
C.

Why do phospholipids form a double layer in the cell membrane?

The tails bond to each other. (Phospholipids form a double layer because heads, water loving, are attracted to the water in the cytoplasm inside the cell and the watery fluids outside the cell.
  • Why would they make poor receptors?

    To bind the receptor causes a response beyond the cell membrane and the enzyme facilitates a chemical change in the substrate. If proteins were rigid, they would make poor receptors because the proteins has to have a certain shape and molecule to bond to. Insulin helps cells take up sugar from the blood.
  • Why do the phospholipids in the cell membrane form a bilayer?

    Being cylindrical, phospholipid molecules spontaneously form bilayers in aqueous environments. In this energetically most-favorable arrangement, the hydrophilic heads face the water at each surface of the bilayer, and the hydrophobic tails are shielded from the water in the interior.
  • What is the role of the Na+ K+ pump?

    The Sodium-Potassium Pump. The process of moving sodium and potassium ions across the cell membrance is an active transport process involving the hydrolysis of ATP to provide the necessary energy. It involves an enzyme referred to as Na+/K+-ATPase.

Updated: 18th September 2018

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