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4x6 photo signed in lower margin
Photograph signed: "Thomas R. Cech". B/w, 4x6 overall, image 3½x4½ (one surface). Photo by Ken Abbott, Office of Public Relations, University of Colorado at Boulder. The American molecular biochemist was awarded the 1989 Nobel Prize for Chemistry for discovering that RNA (ribonucleic acid), a type of nucleic acid involved in heredity, can also act as an enzyme, aiding a chemical reaction without being changed or consumed. Previously, scientists thought all enzymes were proteins. Cech also found that RNA can duplicate itself, indicating that it may have existed before another unit of heredity known as DNA (deoxyribonucleic acid) and therefore could have been the key molecule in the origin of life billions of years ago. Light crease at upper left blank corner. Label affixed to verso (no show-through). Fine condition.

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Born: December 8, 1947 in Chicago, Illinois

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