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5 Written questions

5 Matching questions

  1. nuclease
  2. primer
  3. histone
  4. radioactive isotope
  5. bacterium
  1. a A small protein with a high proportion of positively charged amino acids that binds to the negatively charged DNA and plays a key role in chromatin structure.
  2. b An isotope (an atomic form of a chemical element) that is unstable; the nucleus decays spontaneously, giving off detectable particles and energy.
  3. c 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. d 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.
  5. e Member of the prokaryotic domain Bacteria.

5 Multiple choice questions

  1. An enzyme that joins RNA nucleotides to make the primer using the parental DNA strand as a template.
  2. A repair system that removes and then correctly replaces a damaged segment of DNA using the undamaged strand as a guide.
  3. Type of DNA replication in which the replicated double helix consists of one old strand, derived from the old molecule, and one newly made strand.
  4. A virus that infects bacteria; also called a phage.
  5. An enzyme that catalyzes the lengthening of telomeres in eukaryotic germ cells.

5 True/False questions

  1. double helixAn 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. heterochromatinThe less condensed form of eukaryotic chromatin that is available for transcription.

          

  3. telomereThe 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.

          

  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. Leading strandA discontinuously synthesized DNA strand that elongates by means of Okazaki fragments, each synthesized in a 5'3' direction away from the replication fork.

          

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