Sia
Question
Biology
Posted 4 months ago
Why does a DNA strand grow only in the 5 ' to 3 ' direction?
A. Because DNA ploymerases can only add nucleotides to the 5 ' end of the growing molecule
B. Because the DNA molecule only unwinds in the to direction
C. Because DNA polymerases can only add nucleotides to the 3 ' end of the growing molecule
D. Because DNA polymerase requires the addition of a starter nucleotide at the 5 ' end
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Answer from Sia
Posted 4 months ago
C
Key Concept
DNA polymerase directionality
Explanation
DNA polymerases add nucleotides to the 3' end of the growing DNA strand because the enzymes require a free 3' hydroxyl (OH) group to attach the new nucleotide. This results in DNA strands growing in the 5' to 3' direction.
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