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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 enzyme is responsible for joining DNA fragments during DNA repair?

Topoisomerase

DNA ligase

DNA polymerase

Helicase

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Verified step by step guidance

Understand the role of each enzyme listed in the problem: Topoisomerase, DNA ligase, DNA polymerase, and Helicase.

Recall that DNA ligase is the enzyme responsible for joining DNA fragments by forming phosphodiester bonds between adjacent nucleotides, especially during DNA repair and replication.

Recognize that Topoisomerase helps relieve the tension in DNA strands by cutting and rejoining DNA to prevent supercoiling, but it does not join fragments in repair.

Know that DNA polymerase synthesizes new DNA strands by adding nucleotides complementary to the template strand but does not join fragments.

Understand that Helicase unwinds the DNA double helix by breaking hydrogen bonds between base pairs, facilitating replication and repair but not joining fragments.