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5 Written questions

5 Matching questions

  1. replication fork
  2. nuclease
  3. primase
  4. origin of replication
  5. nucleosome
  1. a An enzyme that joins RNA nucleotides to make the primer using the parental DNA strand as a template.
  2. b 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.
  3. c 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.
  4. d A Y-shaped region on a replicating DNA molecule where the parental strands are being unwound and new strands are growing.
  5. e Site where the replication of a DNA molecule begins, consisting of a specific sequence of nucleotides.

5 Multiple choice questions

  1. A protein that breaks, swivels, and rejoins DNA strands. During DNA replication, topoisomerase helps to relieve strain in the double helix ahead of the replication fork.
  2. A linking enzyme essential for DNA replication; catalyzes the covalent bonding of the 3' end of one DNA fragment (such as an Okazaki fragment) to the 5' end of another DNA fragment (such as a growing DNA chain).
  3. An enzyme that catalyzes the lengthening of telomeres in eukaryotic germ cells.
  4. The sugar component of DNA nucleotides, having one fewer hydroxyl group than ribose, the sugar component of RNA nucleotides.
  5. A dense region of DNA in a prokaryotic cell.

5 True/False questions

  1. heterochromatinEukaryotic chromatin that remains highly compacted during interphase and is generally not transcribed.


  2. Single-strand DNA-binding protein (SSBPs)The new complementary DNA strand synthesized continuously along the template strand toward the replication fork in the mandatory 5'?3' direction.


  3. pyrimidineAn enzyme that joins RNA nucleotides to make the primer using the parental DNA strand as a template.


  4. 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.


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


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