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4 Written questions

3 Multiple choice questions

  1. The structure of DNA, in which two long strands of covalently bonded nucleotidesare held together by hydrogen bonds and
    twisted into a spiral coil.
  2. The sequence, or order, in which the nitrogenous bases adenine (A), cytosine (C), guanine (G), and thymine (T) are arranged in a gene or a DNA fragment, or in an organism's genome.
  3. A three-step process in which damage to DNA is repaired. Damaged DNA is first recognizedthen removed, and then replaced with newly synthesized DNA.

3 True/False questions

  1. DNA replicationThe 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.


  2. complementary strandThe insertion of an incorrect nitrogenous base during DNA replication that is not detected and corrected.


  3. mismatch errorA substance or energy source that alters DNA.


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