Answer :
Answer:
they are amphipathic molecules.
Explanation:
phospholipids have both hydrophobic and hydrophilic regions, making them amphipathic.
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Phospholipid is a component of the cell membrane, to understand its function we need to know......
Phospholipids
Phospholipids, arranged in a bilayer, make up the basic tissue of the plasma membrane. They are well suited to this function because they are amphiphilic, that is, they have both hydrophilic and hydrophobic regions.
The hydrophilic
The hydrophilic, or water-affinity, part of a phospholipid is its head, which has a negatively charged phosphate group, plus a small additional group (of different identities, "R" in the diagram on the left), which can also be charged or polar. The hydrophilic head of phospholipids in a bilayer membrane faces outward, making contact with the aqueous fluid inside and outside the cell. As water is a polar molecule, it readily forms an electrostatic (charge-based) interaction with the phospholipid heads.
The hydrophobic
The hydrophobic, or "water-afraid" part of a phospholipid consists of its long, nonpolar fatty acid chains. Fatty acid chains can easily interact with other nonpolar molecules, but not very well with water. Because of this, it is more energetically favorable for phospholipids to place their fatty acid chains on the inside of the membrane, where they are protected from the surrounding water. The phospholipid bilayer formed by these interactions provides a good barrier between the inside and outside the cell, because water and other charged or polar substances cannot easily cross the hydrophobic core of the membrane.
With this information, we can conclude that Phospholipids are arranged in a bilayer. They are amphiphilic, that is, they have hydrophilic and hydrophobic regions, which make up the permeability and selectivity of the plasma membrane.
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