(a)[3]
Name the structures indicated by A, B and C in Fig. 1.1.
(b)[2]
Draw an arrow on Fig. 1.1 to indicate the movement of a molecule across the membrane into the cell by facilitated diffusion.
(c)[3]
Explain how the fluidity of the membrane would alter if the proportion of unsaturated fatty acids in the phospholipid bilayer increased.
(d)[1]
The R-groups of amino acids give them different properties. Suggest how the properties of the R-groups of the amino acids at position 1 of P may differ from the R-groups of the amino acids at position 2.