Scientists have discovered that 99.9% of the gene sequence is shared by all humans

Studies of biological factors affecting development of substance-use disorders implicate the neurotransmitter ____

a. dopamine b. adrenaline c. epinephrine d. acetylcholine

The "Asian flushing response" brought about by alcohol use is due to a build-up of _____

a. aldehyde isozyme b. acetylcholine c. acetaldehyde d. anandamide