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5 Written questions

5 Matching questions

  1. Polarity
  2. Neutral mutation
  3. Apoptosis
  4. Genetic code
  5. Homozygous
  1. a The way in which the 64 possible base triplets map onto the 20 amino acids that are used in polypeptide chains.
  2. b Eukaryotic cell or organism that has two identical alleles for a specific gene.
  3. c A mutation that even though it may change a coding sequence exerts no harmful or beneficial effects.
  4. d Programmed cell death. An orderly process by which cells self-destruct in an orderly fashion after a certain number of cell divisions, or if they cannot repair DNA damage.
  5. e Refers to the location of cells with respect to the head end (anterior) or tail end (posterior) of the body.

5 Multiple choice questions

  1. Having two sets of chromosomes (eukaryotic cell or organism). Denoted by 2n.
  2. The points where non-sister chromatids within a bivalent join, where they cross over.
  3. Production of new organisms involving fusion of nuclei from male and female gametes, usually from unrelated individuals. Increases genetic variation in the population.
  4. The formation of an RNA molecule, using a length of DNA as a template and catalysed by RNA polymerase.
  5. 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 True/False questions

  1. Template strandThe DNA strand that is used for assembly of mRNA by RNA polymerase using base-pairing rules. Complementary to the message sequence.


  2. Homeotic selector genesGenes that control the development of the body plan of an organism.


  3. DNA mutationA change in DNA sequence within a gene that does not lead to a change in the amino acid sequence due to the degeneracy of the genetic code.


  4. Homeobox genesEukaryotic cell or organism that has two identical alleles for a specific gene.


  5. GenomeAlleles present within cells of an individual, for a particular trait/characteristic.


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