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Aleksandr [31]
1 year ago
12

Why does a new DNA strand elongate only in the 5' to 3' direction during DNA replication? (A) DNA polymerase begins adding nucle

otides at the 5 ' end of the template. (B) The polarity of the DNA molecule prevents addition of nucleotides at the 3' end. (C) Replication must progress toward the replication fork. (D) DNA polymerase can add nucleotides only to the free 3' end.
Biology
1 answer:
Georgia [21]1 year ago
4 0

A new DNA strand elongate only in the 5' to 3' direction during DNA replication because the  "polarity of the DNA molecule prevents addition of nucleotides at the 3' end" .

DNA replication occurs in the 5' to 3' direction. DNA polymerase can only add nucleotides to the 3' OH group of the growing DNA strand, this is why DNA replication occurs only in the 5' to 3' direction.

DNA polymerase can only add to the 3' end, so the 5' end of the primer remains unaltered. Consequently, synthesis proceeds immediately only along the so-called leading strand.

Hence, the correct answer will be option (B)

To learn more about DNA strand here

brainly.com/question/13542701

#SPJ4

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The question is incomplete. The complete question is:

Question: A gene for corn has two alleles, one for yellow kernels and one for white kernels. Cross pollination of yellow corn and white corn results in ears of corn that have an approximately even mix of yellow and white kernels. Which term best describes the relationship between the two alleles?

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