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5 Written questions

5 Matching questions

  1. primer
  2. template strand
  3. Mismatch repair
  4. bacteria
  5. deoxyribose
  1. a The DNA strand that provides the pattern, or template, for ordering the sequence of nucleotides in an RNA transcript.
  2. b One of two prokaryotic domains, the other being Archaea.
  3. c The cellular process that uses specific enzymes to remove and replace incorrectly paired nucleotides.
  4. d 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. 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. An enzyme that catalyzes the lengthening of telomeres in eukaryotic germ cells.
  2. 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.
  3. A small protein with a high proportion of positively charged amino acids that binds to the negatively charged DNA and plays a key role in chromatin structure.
  4. Eukaryotic chromatin that remains highly compacted during interphase and is generally not transcribed.
  5. A discontinuously synthesized DNA strand that elongates by means of Okazaki fragments, each synthesized in a 5'3' direction away from the replication fork.

5 True/False questions

  1. 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.

          

  2. DNA ligaseA 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).

          

  3. repetitive DNANucleotide 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.

          

  4. 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.

          

  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.