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

DNA strands can be clipped crosswise at selected positions by using enzymes called:

helicases

polymerases

restriction endonucleases

ligases

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Verified step by step guidance

Understand the function of each enzyme listed: helicases unwind the DNA double helix, polymerases synthesize new DNA strands, ligases join DNA fragments together, and restriction endonucleases cut DNA strands at specific sequences.

Recall that the question asks for enzymes that clip DNA strands crosswise at selected positions, which means making cuts at specific sites within the DNA.

Identify that restriction endonucleases are known for recognizing specific DNA sequences and cutting the DNA at or near these sites, effectively clipping the strands crosswise.

Note that helicases and polymerases do not cut DNA strands; helicases separate strands, and polymerases build new strands, while ligases join DNA fragments but do not cut them.

Conclude that the enzyme responsible for clipping DNA strands crosswise at selected positions is the restriction endonuclease.