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5 Written questions

5 Matching questions

  1. Lagging strand
  2. DNA polymerase
  3. phage
  4. transformation
  5. x-ray crystallography
  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 A virus that infects bacteria; also called a bacteriophage.
  3. c A discontinuously synthesized DNA strand that elongates by means of Okazaki fragments, each synthesized in a 5'3' direction away from the replication fork.
  4. d 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.
  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. 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. An isotope (an atomic form of a chemical element) that is unstable; the nucleus decays spontaneously, giving off detectable particles and energy.
  3. One of two prokaryotic domains, the other being Archaea.
  4. A repair system that removes and then correctly replaces a damaged segment of DNA using the undamaged strand as a guide.
  5. Member of the prokaryotic domain Bacteria.

5 True/False questions

  1. Mismatch repairThe cellular process that uses specific enzymes to remove and replace incorrectly paired nucleotides.

          

  2. 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.

          

  3. replication forkA Y-shaped region on a replicating DNA molecule where the parental strands are being unwound and new strands are growing.

          

  4. 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.

          

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

          

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