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Home Q & A Board Biology-Related Homework Help Biochemistry
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mikael mikael
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Why does E. coli need both DNA polymerase III and DNA polymerase I?
A) DNA polymerase III lacks the 5' ? 3' exonuclease activity needed to remove RNA primers.
B) Each polymerase is specific for only one strand of DNA. DNA polymerase III acts only on the leading strand, and DNA polymerase I acts only on the lagging strand.
C) DNA polymerase I is needed to join the Okazaki fragments.
D) The DNA replication is bidirectional; one polymerase is used for each direction.
E) Only DNA polymerase I has proofreading ability.
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padrepadre
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mikael Author
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Thanks Padre
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