Question: Is proinsulin a protein?
SPARQL query:
PREFIX res: <http://dbpedia.org/resource/>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX onto: <http://dbpedia.org/ontology/>
ASK
WHERE 
{
	res:Proinsulin rdf:type onto:Protein .
}