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5 Written questions

5 Matching questions

  1. Genetic code
  2. Stutter mutation
  3. Allele
  4. Meiosis
  5. Proto-oncogene
  1. a Causes an expansion or contraction of a run of identical codons within a gene affecting the length of a run of identical amino acids in the polypeptide.
  2. b The way in which the 64 possible base triplets map onto the 20 amino acids that are used in polypeptide chains.
  3. c Gene that can undergo mutations to become an oncogene, which induces tumour formation (cancer).
  4. d An alternative version of a gene carrying sequence differences.
  5. e Type of nuclear division. A reduction division. The chromosome number is halved. It involves two divisions. It produces cells that are genetically different from each other and from the parent cell.

5 Multiple choice questions

  1. Stage of protein/polypeptide synthesis in which the amino acids are assembled at ribosomes according to the genetic code.
  2. Alleles present within cells of an individual, for a particular trait/characteristic.
  3. Structure formed on the centromere that attaches the chromosomes to the spindle fibres during mitosis and meiosis.
  4. Variation of genetic information in a gene pool.
  5. A short length of about 100 RNA nucleotides that adopts a clover leaf structure and carries an amino acid to the ribosome to be incorporated into a growing polypeptide chain.

5 True/False questions

  1. OperonA sequence of three bases that codes for a single amino acid according to the genetic code.


  2. Insertion/deletion mutationA change in DNA sequence involving the introduction or loss of 1- 1000s of bases.


  3. Missense mutationA change in DNA sequence that introduces a premature stop codon within a DNA coding sequence.


  4. Nonsense mutationA change in DNA sequence that leads to a change in the amino acid sequence coded for by a gene.


  5. HeterozygousEukaryotic cell or organism that has two different alleles for a specific gene.