5 Written questions
5 Matching questions
- Genetic code
- Stutter mutation
- 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.
- b The way in which the 64 possible base triplets map onto the 20 amino acids that are used in polypeptide chains.
- c Gene that can undergo mutations to become an oncogene, which induces tumour formation (cancer).
- d An alternative version of a gene carrying sequence differences.
- 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
- Stage of protein/polypeptide synthesis in which the amino acids are assembled at ribosomes according to the genetic code.
- Alleles present within cells of an individual, for a particular trait/characteristic.
- Structure formed on the centromere that attaches the chromosomes to the spindle fibres during mitosis and meiosis.
- Variation of genetic information in a gene pool.
- 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
Operon → A sequence of three bases that codes for a single amino acid according to the genetic code.
Insertion/deletion mutation → A change in DNA sequence involving the introduction or loss of 1- 1000s of bases.
Missense mutation → A change in DNA sequence that introduces a premature stop codon within a DNA coding sequence.
Nonsense mutation → A change in DNA sequence that leads to a change in the amino acid sequence coded for by a gene.
Heterozygous → Eukaryotic cell or organism that has two different alleles for a specific gene.