Question

Guess the word:

I am the boundary of the cell, made up of lipids and proteins. I control the substances entering or leaving the cell.

Answer 1

Plasma membrane :

1. The plasma membrane is the outer limiting boundary of the cell and acts as a barrier for the transport of materials in and out of the cell.
2. It is made up of phospholipid bilayer and proteins.
3. It selectively allows certain substances to enter the cell.

Final answer :

The plasma membrane is the boundary of the cell, made up of lipids and proteins, and controls the substances entering or leaving the cell.