Question

3.
Plasma membrane is :
A) selectively permeable membrane
C) both A and B
B) living flexible membrane
D) living non flexible membrane​

Answer 1

Answer:

Plasma membrane is the outer covering of all cells but it is present below the cell wall in plant cells. It is composed of phospholipid bilayer structure with embedded proteins and gives the mosaic-like appearance. Plasma membrane is a semi-permeable. It is also selectively or differentially permeable. Semi permeable means half permeable, i.e., plasma membrane will allow free transport of solvent like water across it but will not allow free transport of solute particles. For solute particles the plasma membrane is selectively or differentially permeable, i.e., it will allow only selected solute particles to pass through and will have differential permeability for different solute particles. Thus, the correct answer is option A.

Answer 2

Explanation:

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A) selectively permeable membrane

The plasma membrane, also called the cell membrane, is the membrane found in all cells that separates the interior of the cell from the outside environment. ... The plasma membrane consists of a lipid bilayer that is semipermeable. The plasma membrane regulates the transport of materials entering and exiting the cell.