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5 Written Questions

5 Matching Questions

  1. nuclease
  2. template strand
  3. nucleoid region
  4. bacteria
  5. deoxyribose
  1. a An enzyme that cuts DNA or RNA, either removing one or a few bases or hydrolyzing the DNA or RNA completely into its component nucleotides.
  2. b The sugar component of DNA nucleotides, having one fewer hydroxyl group than ribose, the sugar component of RNA nucleotides.
  3. c The DNA strand that provides the pattern, or template, for ordering the sequence of nucleotides in an RNA transcript.
  4. d A dense region of DNA in a prokaryotic cell.
  5. e One of two prokaryotic domains, the other being Archaea.

5 Multiple Choice Questions

  1. A virus that infects bacteria; also called a phage.
  2. The tandemly repetitive DNA at the end of a eukaryotic chromosome's DNA molecule that protects the organism's genes from being eroded during successive rounds of replication. See also repetitive DNA.
  3. A virus that infects bacteria; also called a bacteriophage.
  4. A repair system that removes and then correctly replaces a damaged segment of DNA using the undamaged strand as a guide.
  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. helicaseAn enzyme that untwists the double helix of DNA at the replication forks, separating the two strands and making them available as template strands.

          

  2. chromatinThe 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. DNA polymeraseAn 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. telomeraseAn enzyme that catalyzes the lengthening of telomeres in eukaryotic germ cells.

          

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

          

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