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5 Written questions

5 Matching questions

  1. deletion
  2. spliceosome
  3. RNA polymerase
  4. signal-recognition particle (SRP)
  5. transcription
  1. a 1) A deficiency in a chromosome resulting from the loss of a fragment through breakage. (2) A mutational loss of one or more nucleotide pairs from a gene.
  2. b An enzyme that links together the growing chain of ribonucleotides during transcription.
  3. c The synthesis of RNA on a DNA template.
  4. d A complex assembly that interacts with the ends of an RNA intron in splicing RNA, releasing the intron and joining the two adjacent exons.
  5. e A protein-RNA complex that recognizes a signal peptide as it emerges from the ribosome.

5 Multiple choice questions

  1. The modified end of the 3' end of an mRNA molecule consisting of the addition of some 50 to 250 adenine nucleotides.
  2. The most common type of mutation, a base-pair substitution in which the new codon makes sense in that it still codes for an amino acid.
  3. A promoter DNA sequence crucial in forming the transcription initiation complex.
  4. The removal of noncoding portions (introns) of the RNA molecule after initial synthesis.
  5. A mutation occurring when the number of nucleotides inserted or deleted is not a multiple of three, resulting in the improper grouping of the following nucleotides into codons.

5 True/False questions

  1. base-pair substitutionA type of point mutation; the replacement of one nucleotide and its partner in the complementary DNA strand by another pair of nucleotides.

          

  2. poly-many

          

  3. exo-out, outside, without

          

  4. 5' capThe end of a pre-mRNA molecule modified by the addition of a cap

          

  5. ribosomeAn enzymatic RNA molecule that catalyzes reactions during RNA splicing.

          

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