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5 Written questions

5 Matching questions

  1. DNA polymerase
  2. nucleotide excision repair
  3. nucleoid
  4. telomerase
  5. phage
  1. a An enzyme that catalyzes the lengthening of telomeres in eukaryotic germ cells.
  2. b A repair system that removes and then correctly replaces a damaged segment of DNA using the undamaged strand as a guide.
  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 A virus that infects bacteria; also called a bacteriophage.

5 Multiple choice questions

  1. 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.
  2. An isotope (an atomic form of a chemical element) that is unstable; the nucleus decays spontaneously, giving off detectable particles and energy.
  3. The sugar component of DNA nucleotides, having one fewer hydroxyl group than ribose, the sugar component of RNA nucleotides.
  4. A dense region of DNA in a prokaryotic cell.
  5. A Y-shaped region on a replicating DNA molecule where the parental strands are being unwound and new strands are growing.

5 True/False questions

  1. primaseA 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.

          

  2. transformationThe 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. semiconservative modelNucleotide sequences, usually noncoding, that are present in many copies in a eukaryotic genome. The repeated units may be short and arranged tandemly (in series) or long and dispersed in the genome.

          

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

          

  5. Okazaki fragmentA virus that infects bacteria; also called a phage.

          

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