How did Zhang and Cech purify the RNA molecules that were able to catalyze the linkage between two amino acids?
a. passing the reaction mixture through a column that binds biotin
b. passing the reaction mixture through a column that binds all proteins
c. passing the reaction mixture through a column that binds RNA
d. centrifuging the reaction mixture to concentrate the proteins
e. centrifuging the reaction mixture to concentrate the RNA molecules
ANSWER: a
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