Cells mutant in _____ gene can be selected by using 5-fluoro orotic acid, which is turned into ____ products by wild type protein.

Cells mutant in _____ gene can be selected by using 5-fluoro orotic ac

1.	Cells mutant in _____ gene can be selected by using 5-fluoro orotic acid, which is turned into ____ products by wild type protein.
A.	SUP4, toxic
B.	SUP4, non-toxic
C.	URA3, toxic
D.	URA3, non-toxic
Answer» D. URA3, non-toxic