20. Most protein kinases transfer phosphate groups to which amino acid(s)?

1. Glutamate 

2. Threonine

3. Serine 

4. Tyrosine 

5. Lysine 

6. Arginine
(A) 1,2,3,4
(B) 2,3,5
(C) 1,2,3
(D)2.3.4
(E) 1,2,6

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