5. In reality, FGF exists as a dimer that binds to two receptors at the same time. This situation can be represented on an LL grid (see drawing with L=5 ). Here each grid location represents one receptor, and each dot represents a monomer of FGF. The pair of dots represents an FGF dimer. A) Consider a single FGF dimer bound to a grid of receptors. Find S(L). B) Show that S is proportional to lnL for large L. C) Using your result in (B), explain why a sparse distribution of FGF dimers resembles an ideal gas in terms of entropy