Question

The main function of a plasma membrane is to-
1. Move the cell from place to place
2. Prevent water from entering or leaving
3. Control what goes in and out of the cell
4. Act as a sieve, allowing only lipids to pass

Answer 1

Correct Answer - Option 3 : Control what goes in and out of the cell

The correct answer is Control what goes in and out of the cell.

 

• The plasma membrane is a thin outer layer of the cell.
• It is basically a semipermeable membrane in nature and interacts with the outside world.
• Transport of the molecules across the cell is the main function of the plasma membrane.
  • It controls what goes in and out of the cell.
  • It also provides mechanical support to the cell.
• The plasma membrane is also called the selectively permeable membrane.
  • It is selectively permeable to some molecules present on either side of it.
• Many molecules can move briefly across the membrane without any requirement of energy by passive transport.
• Basically, the plasma membrane is made of lipid and protein in which between a layer of lipid two identical layers of proteins are confined.