Normal cell division requires
A) inactivated proto-oncogenes and activated tumor suppressor genes.
B) inactivated proto-oncogenes and inactivated tumor suppressor genes.
C) activated proto-oncogenes and activated tumor suppressor genes.
D) activated proto-oncogenes and inactivated tumor suppressor genes.
Ans: C) activated proto-oncogenes and activated tumor suppressor genes.
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According to the table and the figure above, which enzyme is defective in the strain with the arg2 mutation?
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