[Solved] A patient with a chromosomal complement of XXX has A) a male phenotype B) a female phenotype C) a very short life span D) a higher IQ than his/her siblings E) trisomy of autosomes Drug Molecule: A chemical compound pharmacologically active and used in the diagnosis, treatment, or prevention of diseases. Neurotransmitter's Action: The action of neurotransmitters involves the chemical substances transferring signals from one neuron to another across synapses in the brain or throughout the nervous system. Agonist: A chemical substance that binds to and activates receptor cells to produce a biological response. Synaptic Gap: The synaptic gap is the tiny space between neurons through which neurotransmitters travel to communicate signals.