Monoclonal antibodies: I don't think we need to know much about monoclonal antibodies as it is a very small dot point. I'm just planning on revising both but not in great detail.
Mammals: I really need to revise the evolution timeline so can't help much with that, from my understanding the dinosaurs were wiped out and then giant mammals evolved as a result of the lack of competition, then due to too many resources being used (big animals need more food than small animals) etc. they evolved to be smaller (aka current mammals)
Neurotransmitters: My teacher taught a few of us how it happens at a lunch time so I get the impression you don't need to know it. It isn't outlined on the study design specifically, neurotransmitters are just mentioned as a signalling molecule.
I would say that you only need to know that an electrical impulse (action potential) reaches the end of a pre-synaptic neuron, causing vesicles in the end of the neuron (axon terminal) containing a neurotransmitter to degranulate (release their contents) into the synaptic gap. The neurotransmitter diffuses across the synapse and binds to a (highly specific) ligand-gated channel protein, causing the channel protein to open, allowing ions to enter which causes an electrical impulse in the post-synaptic neuron (or target gland, muscle), the process repeats until it reaches its target tissue.
EDIT: Clarity