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5 Written questions

5 Matching questions

  1. Allele
  2. Transcription
  3. Gene
  4. Spindle fibres
  5. Recessive
  1. a A length of DNA that codes for one (or more) polypeptides/proteins. Some may code for RNA or regulate other genes.
  2. b An alternative version of a gene carrying sequence differences.
  3. c The formation of an RNA molecule, using a length of DNA as a template and catalysed by RNA polymerase.
  4. d Characteristic in which the allele responsible is only expressed in the phenotype if there is no dominant allele present.
  5. e Made of microtubules, these structures are responsible for providing the framework for segregation of the chromosomes during mitosis and meiosis.

5 Multiple choice questions

  1. The DNA strand that is used for assembly of mRNA by RNA polymerase using base-pairing rules. Complementary to the message sequence.
  2. 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.
  3. A change in DNA sequence that leads to a change in the amino acid sequence coded for by a gene.
  4. 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. Observable characteristics of an organism.

5 True/False questions

  1. transfer RNAA 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.

          

  2. Insertion/deletion mutationA change in DNA sequence that introduces a premature stop codon within a DNA coding sequence.

          

  3. Genetic variationVariation of genetic information in a gene pool.

          

  4. DegenerateA length of DNA that codes for one (or more) polypeptides/proteins. Some may code for RNA or regulate other genes.

          

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