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Answer:

Phospholipid bilayer determinates which molecules can enter or exit the cell so its purpose is to be a checker in the middle. Cell membrane determinates the structure of the cell and it is the connection to the rest that happens in a cell.

Explanation:

Molecules can move in 2 ways: passive and active.

The only difference is the energy that is needed to do the movement.

In passive mechanisms, energy is not used, while in active transport, energy is needed. Diffusion or passive transport are moving the concentration from hight to low so the energy is not necessary. Active transport moves from low to a high concentration and it uses metabolic energy.

The phospholipid bilayer is a thin membrane that is made up of lipid molecules, which have hydrophobic and hydrophilic ends. The membrane is involved in the active and passive transport of the molecules.

Active and Passive Transport of Molecules:

  • Active transport in the phospholipid bilayer is defined as the transport of molecules or substances across the membrane by the expenditure of energy or ATP molecule.

  • Passive transport refers to the transport of molecules or substances that easily diffuse through the bilayer and dissolve in the aqueous part present on the other side of the membrane.

Thus, active transport requires energy, while the mechanism through passive transport involves diffusion.

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