Gibberellic acid stimulates the cells of germinating grass seeds to produce mRNA molecules that code for hydrolytic enzymes. In this case the role of gibberellic acid can best be described as that of
A. a regulator of gene activity
B. a stimulator of hydrolase secretion
C. a stimulator of DNA replication
D. an allosteric activator of hydrolase
E. an activator of translation
Ans: A. a regulator of gene activity
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