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5 Written questions

5 Matching questions

  1. primase
  2. helicase
  3. euchromatin
  4. telomere
  5. repetitive DNA
  1. a An enzyme that untwists the double helix of DNA at the replication forks, separating the two strands and making them available as template strands.
  2. b 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. c The less condensed form of eukaryotic chromatin that is available for transcription.
  4. d Nucleotide 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.
  5. e An enzyme that joins RNA nucleotides to make the primer using the parental DNA strand as a template.

5 Multiple choice questions

  1. A dense region of DNA in a prokaryotic cell.
  2. A technique that depends on the diffraction of an X-ray beam by the individual atoms of a crystallized molecule to study the three-dimensional structure of the molecule.
  3. An isotope (an atomic form of a chemical element) that is unstable; the nucleus decays spontaneously, giving off detectable particles and energy.
  4. The sugar component of DNA nucleotides, having one fewer hydroxyl group than ribose, the sugar component of RNA nucleotides.
  5. The form of native DNA, referring to its two adjacent antiparallel polynucleotide strands wound around an imaginary axis into a spiral shape.

5 True/False questions

  1. Single-strand DNA-binding protein (SSBPs)A protein that binds to the unpaired DNA strands during DNA replication, stabilizing them and holding them apart while they serve as templates for the synthesis of complementary strands of DNA.


  2. bacteriumMember of the prokaryotic domain Bacteria.


  3. bacteriophageA virus that infects bacteria; also called a phage.


  4. 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.


  5. 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.