What protein is responsible for giving blood its color?

More Questions:

The first American blood bank was established in 1937 in which city?

Nepetalactone is the active ingredient in what pet product?

What US state includes the telephone area code 608?

What food item shares its name with Brad and Janet's hospitable host in "The Rocky Horror Picture Show"?

Who wrote the opera "The Turn of the Screw"?

What is the longest river in Europe?

What four US states start with the letter I?

How many tentacles does a squid have?

Who has been played in a movie by both Kirk Douglas and Tim Roth?

Who directed the movie "Taxi Driver"?

What popular actor won Western Australia's junior chess championship at age 10?

For which movie did director John Schlesinger receive an Oscar in 1970?

What two metal bands are honored on Beavis and Butt-head's usual t-shirts?

Whose first hit single was titled "Stubborn Kind of Fellow"?

Who was the last US president of the 19th century?