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5 Written questions

5 Matching questions

  1. DNA ligase
  2. template strand
  3. Single-strand DNA-binding protein (SSBPs)
  4. pyrimidine
  5. x-ray crystallography
  1. a 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).
  2. b 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.
  3. c A technique that depends on the diffraction of an X-ray beam by the individual atoms of a crystallized molecule to study the three-dimensional structure of the molecule.
  4. d The DNA strand that provides the pattern, or template, for ordering the sequence of nucleotides in an RNA transcript.
  5. e One of two types of nitrogenous bases found in nucleotides, characterized by a six-membered ring. Cytosine (C), thymine (T), and uracil (U) are pyrimidines.

5 Multiple choice questions

  1. The sugar component of DNA nucleotides, having one fewer hydroxyl group than ribose, the sugar component of RNA nucleotides.
  2. The cellular process that uses specific enzymes to remove and replace incorrectly paired nucleotides.
  3. A dense region of DNA in a prokaryotic cell.
  4. (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.
  5. An enzyme that untwists the double helix of DNA at the replication forks, separating the two strands and making them available as template strands.

5 True/False questions

  1. Lagging strandA discontinuously synthesized DNA strand that elongates by means of Okazaki fragments, each synthesized in a 5'3' direction away from the replication fork.

          

  2. bacteriumOne of two prokaryotic domains, the other being Archaea.

          

  3. bacteriaMember of the prokaryotic domain Bacteria.

          

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

          

  5. nucleotide excision repairA repair system that removes and then correctly replaces a damaged segment of DNA using the undamaged strand as a guide.