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Ch. 11 - Gene Mutation, DNA Repair, and Homologous Recombination
Sanders - Genetic Analysis: An Integrated Approach 3rd Edition
Sanders3rd EditionGenetic Analysis: An Integrated ApproachISBN: 9780135564172당신이 사용하는 게 아니라요?교과서 변경
모든 교과서Sanders 3rd EditionCh. 11 - Gene Mutation, DNA Repair, and Homologous Recombination문제 13f
11장, 문제 13f

Answer the following questions concerning the accuracy of DNA polymerase during replication.
DNA mismatch repair can accurately distinguish between the template strand and the newly replicated strand of a DNA duplex. What characteristic of DNA strands is used to make this distinction?

검증된 단계별 안내
1
Understand the role of DNA mismatch repair: DNA mismatch repair is a system that corrects errors introduced during DNA replication, such as mismatched base pairs.
Recognize the key characteristic used for strand distinction: DNA mismatch repair relies on the fact that the newly synthesized strand is not yet fully modified compared to the template strand.
Explain the specific modification: In prokaryotes, the template strand is methylated at specific sites (e.g., adenine residues in GATC sequences), while the newly synthesized strand is temporarily unmethylated.
Describe how this distinction is utilized: The mismatch repair machinery identifies the unmethylated strand as the newly synthesized strand and corrects errors on this strand to match the template strand.
Highlight the importance of timing: The methylation of the newly synthesized strand occurs after a short delay, allowing the repair system to distinguish between the strands during replication.

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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

DNA Mismatch Repair

DNA mismatch repair is a cellular mechanism that corrects errors that occur during DNA replication. It identifies and repairs mismatched base pairs, ensuring the fidelity of DNA synthesis. This process is crucial for maintaining genetic stability and preventing mutations that could lead to diseases, including cancer.
추천 영상:
가이드 코스
05:44
Repair Pathways

Template Strand vs. Newly Synthesized Strand

During DNA replication, the original DNA strand is referred to as the template strand, while the newly synthesized strand is created based on this template. The distinction between these two strands is essential for mismatch repair, as the repair machinery must recognize which strand contains the correct sequence and which contains the error.
추천 영상:
가이드 코스
03:03
Double Strand Breaks

DNA Strand Methylation

One key characteristic used to distinguish between the template and newly synthesized strands is DNA strand methylation. In many organisms, the template strand is often methylated, while the newly synthesized strand is not immediately methylated. This difference allows the mismatch repair system to identify and correct errors by targeting the unmethylated strand.
추천 영상:
가이드 코스
03:03
Double Strand Breaks
관련 실천
교과서 질문

Several types of mutation are identified and described in the chapter. These include (1) promoter mutation, (2) splice site mutation, (3) missense mutation, (4) frameshift mutation, and 5) nonsense mutation. Match the following mutation descriptions with the type(s) of mutations listed above. More than one mutation type might match a description.


A mutation that produces about 5% of the wild-type amount of an mRNA.

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교과서 질문

Answer the following questions concerning the accuracy of DNA polymerase during replication.

If a replication error escapes detection and correction, what kind of abnormality is most likely to exist at the site of the replication error?

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교과서 질문

Answer the following questions concerning the accuracy of DNA polymerase during replication.

Identify two mechanisms that can correct the kind of abnormality resulting from the circumstances identified in part (c).

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교과서 질문

Answer the following questions concerning the accuracy of DNA polymerase during replication.

If the kind of abnormality identified in part (c) is not corrected before the next DNA replication cycle, what kind of mutation occurs?

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교과서 질문

Several types of mutation are identified and described in the chapter. These include (1) promoter mutation, (2) splice site mutation, (3) missense mutation, (4) frameshift mutation, and 5) nonsense mutation. Match the following mutation descriptions with the type(s) of mutations listed above. More than one mutation type might match a description.


A mutation that produces a mutant protein that differs from the wild-type protein at one amino acid position.

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교과서 질문

Several types of mutation are identified and described. These include (1) promoter mutation, (2) splice site mutation, (3) missense mutation, (4) frameshift mutation, and 5) nonsense mutation. Match the following mutation descriptions with the type(s) of mutations listed above. More than one mutation type might match a description.


A mutation that changes several amino acids in a protein and results in a protein that is shorter than the wild-type product.

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