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5 Written questions

5 Matching questions

  1. topoisomerase
  2. Lagging strand
  3. semiconservative model
  4. nuclease
  5. primase
  1. a An enzyme that joins RNA nucleotides to make the primer using the parental DNA strand as a template.
  2. b 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.
  3. c 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.
  4. d 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.
  5. e A discontinuously synthesized DNA strand that elongates by means of Okazaki fragments, each synthesized in a 5'3' direction away from the replication fork.

5 Multiple choice questions

  1. 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.
  2. A virus that infects bacteria; also called a phage.
  3. A repair system that removes and then correctly replaces a damaged segment of DNA using the undamaged strand as a guide.
  4. 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.
  5. (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.

5 True/False questions

  1. deoxyriboseAn enzyme that untwists the double helix of DNA at the replication forks, separating the two strands and making them available as template strands.

          

  2. x-ray crystallographyA 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. nucleoid regionA dense region of DNA in a prokaryotic cell.

          

  4. origin of replication(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.

          

  5. telomeraseThe 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.