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How is the plasma membrane of a cell organized?
Question 15 options:

one layer of phospholipids, through which proteins freely move

one layer of phospholipids, which are laid out end-to-end, with a hydrophobic tail touching a hydrophilic head

two layers of phospholipids, each of which has its hydrophilic side turned inward

two layers of phospholipids, with their polar hydrophilic heads facing away from each other

Answer :

Answer:

The plasma membrane of a cell is organised as:

Two layers of phospholipids, with their polar hydrophilic heads facing away from each other.

Explanation:

  • Plasma membrane forms the external boundary of the cell.
  • The Plasma membrane is selectively permeable and allows only selected solute molecules to pass through it.
  • The Basic structure of the plasma membrane is the lipid bilayer.
  • This bilayer is composed of two leaflets of amphipathic lipid molecule.
  • The polar heads of the molecules are in contact with the intra- or extracellular aqueous phase while the non-polar hydrophobic tails face each other forming the hydrophobic interior of the membrane.
  • The three clases of lipids present in lipid bilayer are- phospholipids, glycolipids and sterols.

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