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.
A.

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.
  • Why do phospholipids form a bilayer when placed in water?

    When phospholipids are mixed with water, they spontaneously rearrange themselves to form the lowest free-energy configuration. This means that the hydrophobic regions find ways to remove themselves from water, while the hydrophilic regions interact with water. The resulting structure is called a lipid bilayer.
  • What is meant by the term phospholipid bilayer?

    phospholipid bilayer. Word Origin. a two-layered arrangement of phosphate and lipid molecules that form a cell membrane, the hydrophobic lipid ends facing inward and the hydrophilic phosphate ends facing outward.
  • What is the definition of lipid bilayer?

    The lipid bilayer (or phospholipid bilayer) is a thin polar membrane made of two layers of lipid molecules. These membranes are flat sheets that form a continuous barrier around all cells.
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 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.
  • How do endocytosis and exocytosis differ from diffusion?

    Diffusion is passive, uncontrolled by the cell for nonpolar molecules. It occurs passively without any control from the cell itself. Endo/Exocytosis is the absorption or secretion of polar molecules through the cell membrane. It is an energy consuming process where the cell has complete control over it.
  • 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.
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.
  • 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.
  • How does a Steve demonstrate the property of selective permeability?

    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.
  • What substances can and Cannot diffuse through the lipid bilayer?

    Small nonpolar molecules, such as O2 and CO2, are soluble in the lipid bilayer and therefore can readily cross cell membranes. Small uncharged polar molecules, such as H2O, also can diffuse through membranes, but larger uncharged polar molecules, such as glucose, cannot.

Updated: 25th November 2019

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