Question

Plasma membrane helps in
A.Transportation of only water in and out of cell
B.Protein synthesis
C.Osmoregulation
D.Nucleic acid synthesis

Answer 1

Hint: Plasma membrane of the cell which is also called cell membrane is found in all the cells and separates the interior of the cell from the exterior of the cell.

Complete answer:
Cell membrane is a semipermeable membrane of the cell that encloses all the contents and cytoplasm of the cell. It is a phospholipid bilayer with embedded protein. Let us analyze the options to find out the correct option.

Option A: Cell membrane of the cell is responsible for the movement of contents in and out of the cell. It is a semipermeable membrane which allows movement of solvent around it. However, it is not responsible for transportation of only water in and out of the cell. It also helps in transportation of other solute in and out of the cell. Therefore, this is the incorrect option.

Option B: Protein synthesis occurs with the help of ribosomes which are the protein synthesizing machinery of the cell. Plasma membrane of the cell do not play any role in synthesis of proteins. Therefore, this is the incorrect option.

Option C: Osmoregulation is the process of maintaining the water and salt balance also called osmotic pressure across the plasma membrane of the cell. The plasma membrane of the cell not only allows the movement of solvent across it but also the selected solute in order to maintain the osmotic pressure of the cell. Therefore, this is the correct option.

Option D: Nucleic acid synthesis takes place inside the nucleus of the cell. The plasma membrane of the cell do not play any role in synthesis of nucleic acids. Therefore, this is the incorrect option.

Hence, the correct answer is option (C)

Note: Osmoregulation maintains the proper balance of electrolytes in the body of humans despite the external factors such as temperature, diet and the weather conditions.