Q2 of 52 Page 119

Why plasma membrane is called selectively permeable membrane?

The plasma membrane separates the contents of the cell from the outer environment. It allows the entry and exit of only selected molecules in and out of the cell, respectively.


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5

Unicellular organisms differ from multicellular ones. How?

 1

Name the molecules which contribute to the flexibility exhibited by the plasma membrane.

 3

Name the process by which CO2 is removed from the cell.

 4

Apart from gaseous exchange, how is diffusion important for organisms?