5 Written questions
5 Matching questions
- Nonsense mutation
- Insertion/deletion mutation
- Homeotic selector genes
- Spindle fibres
- a 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.
- b These direct the development of individual body segments. They are master genes that control other regulatory genes.
- c A change in DNA sequence that introduces a premature stop codon within a DNA coding sequence.
- d Made of microtubules, these structures are responsible for providing the framework for segregation of the chromosomes during mitosis and meiosis.
- e A change in DNA sequence involving the introduction or loss of 1- 1000s of bases.
5 Multiple choice questions
- Groups of homeobox genes. More complex organisms have more such groups, probably due to a mutation that duplicated them.
- Genetic variation where there are distinct phenotypic categories. Usually controlled by one gene to a few genes. Examples include cystic fibrosis, shape of earlobes in humans and height in pea plants.
- Molecule (nucleotide derivative) found in all living cells and involved in energy transfer. When it is hydrolysed energy is released.
- Variation of genetic information in a gene pool.
- Small vesicle formed that breaks away from the cell membrane during apoptosis
5 True/False questions
Central dogma → The way in which the 64 possible base triplets map onto the 20 amino acids that are used in polypeptide chains.
Crossing over → Macromolecule that is a polymer of many amino acids joined by peptide bonds. May comprise more than one polypeptide chains.
Proto-oncogene → Genes that control the development of the body plan of an organism.
Operon → A stretch of DNA consisting of two or more genes that are transcribed together and coregulated.
Morphogen → A length of messenger RNA carrying multiple ribosomes at different stages of protein synthesis.