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5 Written questions

5 Matching questions

  1. DNA polymerase
  2. nucleotide excision repair
  3. bacteriophage
  4. repetitive DNA
  5. primer
  1. a 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.
  2. b A virus that infects bacteria; also called a phage.
  3. c 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.
  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 A repair system that removes and then correctly replaces a damaged segment of DNA using the undamaged strand as a guide.

5 Multiple choice questions

  1. 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.
  2. A discontinuously synthesized DNA strand that elongates by means of Okazaki fragments, each synthesized in a 5'3' direction away from the replication fork.
  3. The new complementary DNA strand synthesized continuously along the template strand toward the replication fork in the mandatory 5'?3' direction.
  4. The less condensed form of eukaryotic chromatin that is available for transcription.
  5. An enzyme that untwists the double helix of DNA at the replication forks, separating the two strands and making them available as template strands.

5 True/False questions

  1. bacteriaOne of two prokaryotic domains, the other being Archaea.


  2. 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.


  3. topoisomeraseAn enzyme that catalyzes the lengthening of telomeres in eukaryotic germ cells.


  4. 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.


  5. 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.