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5 Written questions

5 Matching questions

  1. pyrimidine
  2. Okazaki fragment
  3. topoisomerase
  4. bacteria
  5. deoxyribose
  1. a 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. b 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.
  3. c One of two prokaryotic domains, the other being Archaea.
  4. d 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.
  5. e The sugar component of DNA nucleotides, having one fewer hydroxyl group than ribose, the sugar component of RNA nucleotides.

5 Multiple choice questions

  1. The DNA strand that provides the pattern, or template, for ordering the sequence of nucleotides in an RNA transcript.
  2. 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. A repair system that removes and then correctly replaces a damaged segment of DNA using the undamaged strand as a guide.
  4. 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. 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 True/False questions

  1. telomeraseThe 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.

          

  2. Mismatch repairThe cellular process that uses specific enzymes to remove and replace incorrectly paired nucleotides.

          

  3. semiconservative modelType of DNA replication in which the replicated double helix consists of one old strand, derived from the old molecule, and one newly made strand.

          

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

          

  5. nucleaseA dense region of DNA in a prokaryotic cell.