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4 Written questions

3 Multiple choice questions

  1. A form of programmed cell death that generally benefits the organism.
  2. The duplication, or copying, of a DNA molecule. DNA replication begins when the hydrogen bonds connecting the two strands of DNA are broken, causing the strands to unwind and separate. Each strand is then used as a template for the construction of a new strand of DNA.
  3. The key enzyme that cells use to replicate their DNA. In DNA technology, DNA polymerase is used in the polymerase chain reaction to make many copies of a gene or other DNA sequence.

3 True/False questions

  1. double helixThe structure of DNA, in which two long strands of covalently bonded nucleotidesare held together by hydrogen bonds and
    twisted into a spiral coil.


  2. complementary strandA strand of DNA whose sequence of bases can pair (according to base-pairing rules) with the sequence of bases found in a focal DNA strand.


  3. base pairA three-step process in which damage to DNA is repaired. Damaged DNA is first recognizedthen removed, and then replaced with newly synthesized DNA.