Question

the figure below is an illustration of a double - stranded dna molecule. the 3’ end of the strand on the left is labeled. which nucleotide was the last nucleotide added during synthesis of the lefthand strand? nucleotide with a g base nucleotide with a c base nucleotide with an a base nucleotide with a t base

Explanation:

DNA synthesis occurs in the 5' to 3' direction. The 3' end of the left - hand strand is labeled. So the last nucleotide added is at the 5' end of this strand. In DNA, the base - pairing rules are A - T and C - G. The nucleotide at the 5' end of the left - hand strand pairs with the nucleotide at the 3' end of the right - hand strand. Since the base at the 3' end of the right - hand strand (opposite the 5' end of the left - hand strand) is A, the base of the last - added nucleotide on the left - hand strand is T.

Answer:

Nucleotide with a T base