Test: GRE Subject Test: Biology

1.

A researcher is trying to identify if caffeine is present in an unknown sample. He chooses to use thin layer chromatography and compare it to a known sample of caffeine. After running the test, he discovers that his unknown sample has the exact same Rf value as the standard caffeine. Which of the following is true about his result?

It is likely that the unknown substance is caffeine

The unknown substance is definitely caffeine

It is unlikely that the unknown substance is caffeine

The unknown substance is definitely not caffeine

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