If DNA polymerase requires a perfectly pairedprimer in order to add the next nucleotide, how is it thatany mismatched nucleotides “escape” this requirementand become substrates for mismatch repair enzymes?

If DNA polymerase requires a perfectly pairedprimer in order to add the next nucleotide, how is it thatany mismatched nucleotides “escape” this requirementand become substrates for mismatch repair enzymes?

Human Heredity: Principles and Issues (MindTap Course List)

11th Edition

ISBN:9781305251052

Author:Michael Cummings

Publisher:Michael Cummings

Chapter11: Genome Alterations: Mutation And Epigenetics

Section: Chapter Questions

Problem 18QP: Replication involves a period of time during which DNA is particularly susceptible to the...

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Concept explainers

Viral Replication

The virus is acellular and considered non-living outside the host cell. The replication of the virus occurs only inside the living cells. Only a few genes are present in the smallest virus, whereas many genes are present in the largest virus. These genes encode specific viral proteins.

Question

If DNA polymerase requires a perfectly paired
primer in order to add the next nucleotide, how is it that
any mismatched nucleotides “escape” this requirement
and become substrates for mismatch repair enzymes?

Definition Definition A complex molecule that makes up a fundamental unit of a DNA or RNA molecule. Nucleotides are composed of a sugar, a nitrogenous base, and a phosphoric acid.

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In the Meselson–Stahl experiment thatestablished the semiconservative nature of DNA replication,the extraction method produced short fragments of DNA. Whatsort of results might have been obtained with longer piecesof DNA?
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