1) (2 pts) Consider a ligand like a neurotransmitter binding to a receptor like in a synapse. This is a simple system: L+RLR Which is governed by the forward rate constant kon and the reverse rate constant koff. a) What order is the forward reaction and what are the units for kon? What order is the reverse reaction and what are the units for koff? b) If at rest (steady-state) the neurotransmitter concentration in the synapse is 250nM and the KD is 1M, what percent of the receptors have ligand bound to them? c) If the KD is 1M and the on-rate constant is 2106M1s1, what is koff