Identify the correct statement for the HAT medium (P) Includes drug aminopterin to block major pathway for synthesis of deoxyri-bonucleotides (Q) Hypoxanthine is precursor for thymidine (R) Includes drug aminopterin to block major pathway for synthesis of polypeptides (S) Cells can grow in presence of aminopterin only if they have enzymes thymidine kinase and hypoxanthine-guanine phosphoribosyl transferase

Identify the correct statement for the HAT medium (P) Includes dr

1.	Identify the correct statement for the HAT medium (P) Includes drug aminopterin to block major pathway for synthesis of deoxyri-bonucleotides (Q) Hypoxanthine is precursor for thymidine (R) Includes drug aminopterin to block major pathway for synthesis of polypeptides (S) Cells can grow in presence of aminopterin only if they have enzymes thymidine kinase and hypoxanthine-guanine phosphoribosyl transferase
A.	P, Q
B.	P, S
C.	R, S
D.	Q, S
Answer» C. R, S

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