1- The primary reaction resulting from exposure to heavy metals would be (choose the best option):
a) The neurotoxicity they produce
b) Affectation of acetylcholinesterase
c) The reaction of these with thiol groups in acetylcholinesterase

2- Side effects of xenobiotics are associated with (choose the best option):
a) Favorable interaction with more than one receptor
b) Stereochemistry
c) non-covalent forces