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5 Written Questions

5 Matching Questions

  1. nucleoid region
  2. DNA polymerase
  3. primase
  4. x-ray crystallography
  5. heterochromatin
  1. a A technique that depends on the diffraction of an X-ray beam by the individual atoms of a crystallized molecule to study the three-dimensional structure of the molecule.
  2. b An enzyme that joins RNA nucleotides to make the primer using the parental DNA strand as a template.
  3. c An enzyme that catalyzes the elongation of new DNA (for example, at a replication fork) by the addition of nucleotides to the 3' end of an existing chain. There are several different DNA polymerases; DNA polymerase III and DNA polymerase I play major roles in DNA replication in prokaryotes.
  4. d A dense region of DNA in a prokaryotic cell.
  5. e Eukaryotic chromatin that remains highly compacted during interphase and is generally not transcribed.

5 Multiple Choice Questions

  1. A repair system that removes and then correctly replaces a damaged segment of DNA using the undamaged strand as a guide.
  2. The sugar component of DNA nucleotides, having one fewer hydroxyl group than ribose, the sugar component of RNA nucleotides.
  3. Member of the prokaryotic domain Bacteria.
  4. One of two types of nitrogenous bases found in nucleotides, characterized by a six-membered ring. Cytosine (C), thymine (T), and uracil (U) are pyrimidines.
  5. An isotope (an atomic form of a chemical element) that is unstable; the nucleus decays spontaneously, giving off detectable particles and energy.

5 True/False Questions

  1. bacteriaOne of two prokaryotic domains, the other being Archaea.


  2. euchromatinThe complex of DNA and proteins that makes up a eukaryotic chromosome. When the cell is not dividing, chromatin exists in its dispersed form, as a mass of very long, thin fibers that are not visible with a light microscope.


  3. topoisomeraseAn enzyme that catalyzes the lengthening of telomeres in eukaryotic germ cells.


  4. Lagging strandThe new complementary DNA strand synthesized continuously along the template strand toward the replication fork in the mandatory 5'?3' direction.


  5. chromatinThe less condensed form of eukaryotic chromatin that is available for transcription.


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