Which neurotransmitter is implicated in the development of Parkinson's disease?
a. GABA
b. dopamine
c. serotonin
d. norepinephrine
Question 2
Why are researchers who study Alzheimer's disease also very interested in Down syndrome?
a. Both are known to be caused by a recessive gene.
b. People with Down syndrome almost always develop Alzheimer's.
c. Both have been linked to dopamine and serotonin deficiencies.
d. Both can be linked to chromosome 21.