Properties of phospholipds

Question 1

In phospholipids, one of the 2 fatty acid molecules is replaced by a

Answer 1

fatty acid is replaced by a phosphate group

Question 2

This phosphate group is……..(water-loving), whereas the two fatty acids are ………….(like in triglycerides)

Answer 2

hydrophilic

hydrophobic

Question 3

This phosphate group is hydrophilic (water-loving), whereas the two fatty acids are hydrophobic (like in triglycerides)

This makes phospholipids suitable for making up the bilayer of cell membranes, with the fatty acids facing …….. and the phosphate groups facing ,…………..

Answer 3

inwards

outwards

Question 4

This is also useful as it means the centre of the phospholipid bilayer is ………. meaning water-soluble substances …..

Answer 4

hydrophobic

cannot easily pass through

Question 5

This allows the cell membrane to act as a

Answer 5

barrier, controlling what substances enter and leave the cell