Question

Which characteristic makes a cell membrane selectively permeable?

Answer 1

A selectively permeable cell membrane is one that allows certain molecules or ions to pass through it by means of active or passive transport.

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Answer 2

The specialized characteristic of a cell membrane that ‘surrounds the cell’ and ‘controls the movement’ of the substance makes it selectively permeable.

Explanation:

• The cell membrane is ‘selectively permeable’. It is comprised of a layer named as phospholipid bilayer, proteins, lipids, and carbohydrates.  

• This distinct nature of the ‘cell membrane’ enables small substances like carbon dioxide and oxygen to pass through. This membrane will allow only certain particles to pass through the cell.  

• The phospholipid bilayer is amphipathic in nature, where the molecules contain both the ‘hydrophobic end’ and hydrophilic end. This is made up of 2 fatty acids, glycerol and a ‘phosphate group’.

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