42. The initial step in the formation of an aminoacyl-tRNA is (A) esterification of the tRNA (B) activation of the amino acid by reaction with ATP (C) activation of the tRNA by reaction with ATP (D) interaction of the mRNA with the tRNA

3. In the sodium-potassium pump (A) sodium is transported out of the cell and potassium into the cell, both against concentration gradients (B) sodium is transported into the cell and potassium out of the cell, both against concentration gradients (C) sodium is transported out of the cell and potassium into the cell, both in the same direction as concentration gradients (D) sodium and potassium are both transported out of the cell against concentration gradients

42. The initial step in the formation of an aminoacyl-tRNA is
(A) esterification of the tRNA
(B) activation of the amino acid by reaction with ATP
(C) activation of the tRNA by reaction with ATP
(D) interaction of the mRNA with the tRNA

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