Table of contents

1. Introduction to Genetics51m
2. Mendel's Laws of Inheritance3h 37m
3. Extensions to Mendelian Inheritance2h 41m
4. Genetic Mapping and Linkage2h 28m
5. Genetics of Bacteria and Viruses1h 21m
6. Chromosomal Variation1h 48m
7. DNA and Chromosome Structure56m
8. DNA Replication1h 10m
9. Mitosis and Meiosis1h 34m
10. Transcription1h 0m
11. Translation58m
12. Gene Regulation in Prokaryotes1h 19m
13. Gene Regulation in Eukaryotes44m
14. Genetic Control of Development44m
15. Genomes and Genomics1h 50m
16. Transposable Elements47m
17. Mutation, Repair, and Recombination1h 6m
18. Molecular Genetic Tools19m
- Genetic Cloning
  9m
- Methods for Analyzing DNA
  9m
19. Cancer Genetics29m
- Overview of Cancer
  21m
- Cancer Mutations
  7m
20. Quantitative Genetics1h 26m
21. Population Genetics50m
- Hardy Weinberg
  19m
- Allelic Frequency Changes
  31m
22. Evolutionary Genetics29m

17. Mutation, Repair, and Recombination

DNA Repair

Genetics

17. Mutation, Repair, and Recombination

DNA Repair

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Multiple Choice

Which type of DNA damage is commonly caused by exposure to X-rays?

Double-strand breaks

Thymine dimers

Mismatch base pairs

Deamination of cytosine

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Verified step by step guidance

Understand that different types of DNA damage are caused by different mutagens or environmental factors. For example, ultraviolet (UV) light commonly causes thymine dimers, while chemical agents can cause deamination or mismatches.

Recall that X-rays are a form of ionizing radiation, which has enough energy to break chemical bonds in DNA molecules.

Recognize that ionizing radiation such as X-rays often causes breaks in the DNA backbone, which can be either single-strand breaks or double-strand breaks.

Identify that among the options given, double-strand breaks are the characteristic and most severe type of DNA damage caused by X-ray exposure.

Conclude that thymine dimers, mismatch base pairs, and deamination of cytosine are typically caused by other agents (UV light, replication errors, and chemical mutagens respectively), not by X-rays.