DNA Repair: Fixing Double-Strand Breaks


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question 1 of 3

If no sister chromatids or homologous chromosomes are available, then what type of double-strand break repair would a cell need to use?

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1. In DNA repair, what enzyme seals up broken parts of the DNA backbone?

2. How do sister chromatids differ from homologous chromosomes?

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About This Quiz & Worksheet

This quiz and corresponding worksheet will help you gauge your knowledge of fixing double-strand breaks in DNA. Make sure you're familiar with the enzyme that seals up broken parts of the DNA backbone, homologous chromosomes and sister chromatids.

Quiz & Worksheet Goals

Use this printable worksheet and quiz to review:

  • Double strand break repairs
  • Enzyme repairing the DNA backbone
  • Differences in a sister chromatid and a homologous chromosome
  • Holliday junction
  • Type of break repair most likely to cause changes

Skills Practiced

This worksheet and quiz will let you practice the following skills:

  • Distinguishing Differences - compare and contrast topics from the lesson, such as a sister chromatid and a homologous chromosome
  • Interpreting information - verify you can read information regarding break repairs and know the possible effects of the repair
  • Knowledge application - use your knowledge to answer questions about the enzyme repairing the DNA backbone

Additional Learning

To learn more about all the cell has to do in this situation, review the corresponding lesson on Fixing Double-Strand Bonds in DNA. This lesson will help you:

  • Define what a double-strand break is
  • Identify what causes a double-strand break in the cells
  • Understand the two ways cells can repair these malfunctions
  • Know what homologous recombination is