Question

Statement (SI): Polar heads of lipid molecules are towards outer side.
Statement (SII): The non-polar tails of lipid molecules are hydrophobic and present towards the outer side
(1) SI and SII are correct
(2) SI and SII are incorrect
(3) SI only correct and SII is incorrect

Answer 1

Each lipid molecule contains two parts; a head and a tail. The head is polar and hydrophilic ( Water loving) and the tail is non-polar and hydrophobic( Water hating). In the plasma membrane, made up of phospholipid bilayer and protein, the polar hydrophilic head lies outside and the Non-polar hydrophobic tail is inside. So statement 1 is correct but statement 2 is wrong. Option3 is correct.