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5 Written questions

5 Matching questions

  1. nucleoid region
  2. DNA ligase
  3. primer
  4. telomerase
  5. Lagging strand
  1. a A dense region of DNA in a prokaryotic cell.
  2. b 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.
  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 A linking enzyme essential for DNA replication; catalyzes the covalent bonding of the 3' end of one DNA fragment (such as an Okazaki fragment) to the 5' end of another DNA fragment (such as a growing DNA chain).
  5. e An enzyme that catalyzes the lengthening of telomeres in eukaryotic germ cells.

5 Multiple choice questions

  1. An enzyme that untwists the double helix of DNA at the replication forks, separating the two strands and making them available as template strands.
  2. 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.
  3. 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.
  4. 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.
  5. One of two prokaryotic domains, the other being Archaea.

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. nucleoidA dense region of DNA in a prokaryotic cell.

          

  3. 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.

          

  4. topoisomeraseA 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. double helixThe form of native DNA, referring to its two adjacent antiparallel polynucleotide strands wound around an imaginary axis into a spiral shape.

          

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