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5 Written questions

5 Matching questions

  1. nucleotide excision repair
  2. chromatin
  3. nucleosome
  4. bacteriophage
  5. transformation
  1. a (1) The conversion of a normal animal cell to a cancerous cell. (2) A change in genotype and phenotype due to the assimilation of external DNA by a cell.
  2. b The 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. c The basic, bead-like unit of DNA packing in eukaryotes, consisting of a segment of DNA wound around a protein core composed of two copies of each of four types of histone.
  4. d A repair system that removes and then correctly replaces a damaged segment of DNA using the undamaged strand as a guide.
  5. e A virus that infects bacteria; also called a phage.

5 Multiple choice questions

  1. A discontinuously synthesized DNA strand that elongates by means of Okazaki fragments, each synthesized in a 5'3' direction away from the replication fork.
  2. A short segment of DNA synthesized away from the replication fork on a template strand during DNA replication, many of which are joined together to make up the lagging strand of newly synthesized DNA.
  3. A short stretch of RNA with a free 3' end, bound by complementary base pairing to the template strand, that is elongated with DNA nucleotides during DNA replication.
  4. Eukaryotic chromatin that remains highly compacted during interphase and is generally not transcribed.
  5. The DNA strand that provides the pattern, or template, for ordering the sequence of nucleotides in an RNA transcript.

5 True/False questions

  1. bacteriaMember of the prokaryotic domain Bacteria.

          

  2. semiconservative modelType of DNA replication in which the replicated double helix consists of one old strand, derived from the old molecule, and one newly made strand.

          

  3. nucleoidAn enzyme that cuts DNA or RNA, either removing one or a few bases or hydrolyzing the DNA or RNA completely into its component nucleotides.

          

  4. 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.

          

  5. radioactive isotopeAn isotope (an atomic form of a chemical element) that is unstable; the nucleus decays spontaneously, giving off detectable particles and energy.