Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart3h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

3. Energy & Cell Processes

DNA Repair

Anatomy & Physiology

3. Energy & Cell Processes

DNA Repair

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Multiple Choice

Which of the following statements about the repair of thymine dimers is true?

Thymine dimers are repaired by the process of nucleotide excision repair.

Thymine dimers are repaired by the process of base excision repair.

Thymine dimers are repaired by the process of homologous recombination.

Thymine dimers are repaired by the process of mismatch repair.

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Verified step by step guidance

Understand what thymine dimers are: Thymine dimers are a type of DNA damage caused by ultraviolet (UV) light, where two adjacent thymine bases bond together, disrupting the DNA structure.

Learn about nucleotide excision repair: This is a DNA repair mechanism that removes bulky lesions, such as thymine dimers, by excising a short single-stranded DNA segment containing the damage.

Differentiate between repair processes: Base excision repair typically fixes small, non-helix-distorting base lesions, while mismatch repair corrects errors that occur during DNA replication. Homologous recombination is involved in repairing double-strand breaks.

Identify the correct repair process for thymine dimers: Nucleotide excision repair is specifically designed to handle the type of damage caused by thymine dimers, making it the correct answer.

Review the steps of nucleotide excision repair: The process involves recognition of the damage, excision of the damaged DNA segment, synthesis of a new DNA strand using the undamaged strand as a template, and ligation to restore the DNA structure.