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5 Written questions

5 Matching questions

  1. Hayflick limit
  2. Polysome
  3. Genetic variation
  4. Central dogma
  5. Silent mutation
  1. a Variation of genetic information in a gene pool.
  2. b A 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.
  3. c A length of messenger RNA carrying multiple ribosomes at different stages of protein synthesis.
  4. d A reference to the fact that normal body cells can only divide a finite number of times, normally about 50 mitotic divisions. In contrast, tumour cells are essentially immortal.
  5. e The fundamental relationship between DNA, RNA and protein first outlined by Francis Crick in 1958.

5 Multiple choice questions

  1. A characteristic where both alleles contribute to the phenotype.
  2. A term applied to the genetic code that describes the fact that more than one triplet code is used to code for all amino acids other than tryptophan and methionine.
  3. One of three triplet codes (UGA, UAG or UAA) that causes the termination of translation by the ribosome.
  4. 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. Alternative term for apoptosis.

5 True/False questions

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

          

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

          

  3. Non-disjunctionFailure of members of a homologous pair of chromosomes, or of a pair of chromatids, to separate during nuclear division.

          

  4. Stutter 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.

          

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