Why Does DNA Synthesis Proceed in a 5′ to 3′

question 75

Multiple Choice

Why does DNA synthesis proceed in a 5′ to 3′ direction?

• A) DNA polymerases can only add nucleotides to the 3′ end of a polynucleotide strand.
• B) The 3′ end of the polynucleotide molecule contains more phosphates than the 5′ end.
• C) DNA unzips in the 5¢ to 3¢ direction.
• D) DNA strands are parallel to each other.
• E) Chromosomes are aligned in the 5′ to 3′ direction in the nucleus.

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