Why Does a DNA Strand Grow Only in the 5ʹ

question 20

Multiple Choice

Why does a DNA strand grow only in the 5ʹ to 3ʹ direction?

• A) because DNA polymerases can only add nucleotides to the 3ʹ end of the growing molecule
• B) because DNA polymerases can only add nucleotides to the 5ʹ end of the growing molecule
• C) because the DNA molecule only unwinds in the 5ʹ to 3ʹ direction
• D) because DNA polymerase requires the addition of a starter nucleotide at the 5ʹ end

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