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5 Written questions

5 Matching questions

  1. Leading strand
  2. bacteriophage
  3. histone
  4. transformation
  5. semiconservative model
  1. a 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.
  2. b (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.
  3. c The new complementary DNA strand synthesized continuously along the template strand toward the replication fork in the mandatory 5'?3' direction.
  4. d A virus that infects bacteria; also called a phage.
  5. e 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.

5 Multiple choice questions

  1. 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.
  2. 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.
  3. 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.
  4. The less condensed form of eukaryotic chromatin that is available for transcription.
  5. A dense region of DNA in a prokaryotic cell.

5 True/False questions

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


  4. x-ray crystallographyA virus that infects bacteria; also called a phage.


  5. deoxyriboseThe sugar component of DNA nucleotides, having one fewer hydroxyl group than ribose, the sugar component of RNA nucleotides.


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