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

Sanders 3rd Edition

Ch. 11 - Gene Mutation, DNA Repair, and Homologous Recombination

문제 6a

11장, 문제 6a

Ultraviolet (UV) radiation is mutagenic.
What kind of DNA lesion does UV energy cause?

검증된 단계별 안내

Understand that ultraviolet (UV) radiation is a type of electromagnetic radiation with wavelengths shorter than visible light, and it has enough energy to interact with DNA molecules.

Learn that UV radiation primarily causes the formation of pyrimidine dimers, which are covalent bonds between adjacent pyrimidine bases (thymine or cytosine) on the same DNA strand.

Recognize that the most common type of pyrimidine dimer is the thymine dimer, where two adjacent thymine bases become covalently linked due to UV exposure.

Understand that these pyrimidine dimers distort the DNA structure, interfering with replication and transcription processes, which can lead to mutations if not repaired.

Explore the DNA repair mechanisms, such as nucleotide excision repair (NER), which cells use to detect and remove pyrimidine dimers, restoring the DNA to its original state.

비슷한 문제에 대한 검증된 영상 답변:

이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.

영상 길이:

주요 개념

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

DNA Lesions

DNA lesions are structural alterations in the DNA molecule that can disrupt its normal function. These lesions can arise from various sources, including environmental factors like UV radiation, which can cause specific types of damage. Understanding DNA lesions is crucial for studying mutagenesis and the mechanisms of DNA repair.

Ultraviolet (UV) Radiation

Ultraviolet (UV) radiation is a form of electromagnetic radiation emitted by the sun and artificial sources. It is known to cause damage to DNA by inducing the formation of pyrimidine dimers, primarily thymine dimers, which can lead to mutations if not repaired. This type of radiation is a significant factor in skin cancer and other genetic disorders.

DNA Repair Mechanisms

DNA repair mechanisms are cellular processes that correct damage to the DNA structure. These mechanisms are essential for maintaining genomic stability and preventing mutations. In the case of UV-induced lesions, nucleotide excision repair is a primary pathway that removes damaged sections of DNA and synthesizes new, correct sequences.

관련 실천

교과서 질문

Researchers interested in studying mutation and mutation repair often induce mutations with various agents. What kinds of gene mutations are induced by

Chemical mutagens? Give two examples.

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교과서 질문

In March 2011 an earthquake measuring approximately 9.0 on the Richter scale struck Fukushima, Japan. Several nuclear reactors at the Fukushima Daichii Nuclear Power Plant were damaged, and nuclear core meltdown occurred. A massive release of radiation accompanied damage to the plant, and 5 years later the incidence of thyroid cancer in children exposed to the radiation was determined to be well over 100 times more frequent than expected without radiation exposure. DNA damage and mutations resulting from radiation exposure are suspected of causing this increased cancer rate. What gene discussed in this chapter might be responsible for pausing the cell cycle of dividing cells long enough for radiation-induced damage to be repaired in cells?

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교과서 질문

UV irradiation causes damage to bacterial DNA. What kind of damage is frequently caused and how does photolyase repair the damage?

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교과서 질문

In March 2011 an earthquake measuring approximately 9.0 on the Richter scale struck Fukushima, Japan. Several nuclear reactors at the Fukushima Daichii Nuclear Power Plant were damaged, and nuclear core meltdown occurred. A massive release of radiation accompanied damage to the plant, and 5 years later the incidence of thyroid cancer in children exposed to the radiation was determined to be well over 100 times more frequent than expected without radiation exposure. DNA damage and mutations resulting from radiation exposure are suspected of causing this increased cancer rate. Do you think it is possible that significant increases in the incidence of other types of cancer will occur in the future among people who were exposed to the Fukushima radiation? Why?

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교과서 질문

Ultraviolet (UV) radiation is mutagenic.

Identify and describe two DNA repair mechanisms that remove UV-induced DNA lesions.

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교과서 질문

Ultraviolet (UV) radiation is mutagenic.

How do UV-induced DNA lesions lead to mutation?

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