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5 Written questions

5 Matching questions

  1. x-ray crystallography
  2. primer
  3. histone
  4. transformation
  5. semiconservative model
  1. a 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.
  2. b 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.
  3. c 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.
  4. d 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.
  5. e (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 Multiple choice questions

  1. The DNA strand that provides the pattern, or template, for ordering the sequence of nucleotides in an RNA transcript.
  2. A short segment of DNA synthesized away from the replication fork on a template strand during DNA replication, many of which are joined together to make up the lagging strand of newly synthesized DNA.
  3. The cellular process that uses specific enzymes to remove and replace incorrectly paired nucleotides.
  4. 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.
  5. 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.

5 True/False questions

  1. nucleoid regionThe 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. radioactive isotopeAn isotope (an atomic form of a chemical element) that is unstable; the nucleus decays spontaneously, giving off detectable particles and energy.

          

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

          

  4. origin of replicationSite where the replication of a DNA molecule begins, consisting of a specific sequence of nucleotides.

          

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

          

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