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5 Written questions

5 Matching questions

  1. nucleotide excision repair
  2. telomerase
  3. heterochromatin
  4. DNA ligase
  5. nucleoid
  1. a Eukaryotic chromatin that remains highly compacted during interphase and is generally not transcribed.
  2. b A dense region of DNA in a prokaryotic cell.
  3. c 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).
  4. d An enzyme that catalyzes the lengthening of telomeres in eukaryotic germ cells.
  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. 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.
  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. A virus that infects bacteria; also called a bacteriophage.
  5. 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.

5 True/False questions

  1. 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.

          

  2. template strandThe new complementary DNA strand synthesized continuously along the template strand toward the replication fork in the mandatory 5'?3' direction.

          

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

          

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

          

  5. euchromatinThe 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.