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5 Written questions

5 Matching questions

  1. heterochromatin
  2. chromatin
  3. replication fork
  4. repetitive DNA
  5. nuclease
  1. a Eukaryotic chromatin that remains highly compacted during interphase and is generally not transcribed.
  2. b A Y-shaped region on a replicating DNA molecule where the parental strands are being unwound and new strands are growing.
  3. c 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.
  4. d 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.
  5. e 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 Multiple choice questions

  1. 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.
  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. A repair system that removes and then correctly replaces a damaged segment of DNA using the undamaged strand as a guide.
  4. An enzyme that joins RNA nucleotides to make the primer using the parental DNA strand as a template.
  5. One of two prokaryotic domains, the other being Archaea.

5 True/False questions

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

          

  2. pyrimidineOne of two types of nitrogenous bases found in nucleotides, characterized by a six-membered ring. Cytosine (C), thymine (T), and uracil (U) are pyrimidines.

          

  3. 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.

          

  4. radioactive isotopeA virus that infects bacteria; also called a phage.

          

  5. telomeraseAn enzyme that catalyzes the lengthening of telomeres in eukaryotic germ cells.

          

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