Resistance to methotrexate, which inhibits the enzyme dihydrofolate re – McqOptions

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1.	Resistance to methotrexate, which inhibits the enzyme dihydrofolate reductase (DHFR) is used as a selectable marker. This enzyme is involved in the synthesis of _____ carbon units and is required for _____ biosynthesis.
A.	two, nucleoside
B.	two, nucleotide
C.	one, nucleotide
D.	one, nucleoside
Answer» E.

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