Table of contents

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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 primarily responsible for cutting DNA into small fragments during the process of DNA repair?

DNA polymerase

DNA ligase

Endonuclease

Helicase

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Verified step by step guidance

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

Recall that DNA polymerase is mainly responsible for synthesizing new DNA strands by adding nucleotides during replication and repair, but it does not cut DNA.

Recognize that DNA ligase functions to join DNA fragments together by forming phosphodiester bonds, especially during repair and replication, but it does not cut DNA.

Identify that helicase unwinds the DNA double helix by breaking hydrogen bonds between base pairs, facilitating replication and repair, but it does not cut DNA strands.

Conclude that endonucleases are enzymes that cleave the phosphodiester bonds within a DNA strand, cutting DNA into smaller fragments, which is essential during DNA repair processes.