Some food companies have stopped using genetically modified crops as sources for their foods. But if you are like many Americans, you may think you don't know enough about the issue to know whether you agree or disagree with those who pressed for these changes.

A May 2000 survey by the International Food Information Council found that only one in five Americans consider themselves informed about foods produced with genetically modified organisms (GMOs).

Peter Goldsbrough, a plant scientist and expert in genetically modified crops at Purdue University, has developed nine questions to test your knowledge of genetically modified foods and agricultural biotechnology.

Test your knowledge with this quiz. Click the box to begin.

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