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5 Written questions

5 Matching questions

  1. DNA polymerase
  2. Single-strand DNA-binding protein (SSBPs)
  3. Leading strand
  4. nucleoid region
  5. bacterium
  1. a Member of the prokaryotic domain Bacteria.
  2. b The new complementary DNA strand synthesized continuously along the template strand toward the replication fork in the mandatory 5'?3' direction.
  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 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. e A dense region of DNA in a prokaryotic cell.

5 Multiple choice questions

  1. An isotope (an atomic form of a chemical element) that is unstable; the nucleus decays spontaneously, giving off detectable particles and energy.
  2. The sugar component of DNA nucleotides, having one fewer hydroxyl group than ribose, the sugar component of RNA nucleotides.
  3. A short segment of DNA synthesized away from the replication fork on a template strand during DNA replication, many of which are joined together to make up the lagging strand of newly synthesized DNA.
  4. The 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.
  5. The form of native DNA, referring to its two adjacent antiparallel polynucleotide strands wound around an imaginary axis into a spiral shape.

5 True/False questions

  1. phageA virus that infects bacteria; also called a bacteriophage.

          

  2. template strandThe DNA strand that provides the pattern, or template, for ordering the sequence of nucleotides in an RNA transcript.

          

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

          

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

          

  5. x-ray crystallographyThe new complementary DNA strand synthesized continuously along the template strand toward the replication fork in the mandatory 5'?3' direction.

          

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