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You may have an opinion on climate change, evolution education, stem-cell research, and science funding. But do you have the facts to back up your opinion? This quiz will test your basic scientific literacy.

18. DNA contains adenine, cytosine, guanine, and what other nucleotide base, which is not found in RNA?

Steve Helber/AP
William & Mary professor Elizabeth Harbron displays vials with merocyanine and rhodamine dye in her lab in Williamsburg, Va.

uracil

adenosine

thymine

deoxyribose

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