Multiple choice

DNA Polymerase III can only add new nucleotides to the ? of the newly growing strand.

  1. 5 prime end

  2. 3 prime end

  3. 4 prime end

  4. 2 prime end
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

DNA polymerase III requires a free 3' hydroxyl group to attach a new nucleotide. Therefore, it can only extend a DNA strand in the 5' to 3' direction, adding to the 3' end.

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