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4 Written questions

3 Multiple choice questions

  1. 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.
  2. A pair of complementary nitrogenous bases that have formed hydrogen bonds with each other.
  3. The structure of DNA, in which two long strands of covalently bonded nucleotidesare held together by hydrogen bonds and
    twisted into a spiral coil.

3 True/False questions

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


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


  3. DNA polymeraseThe 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.