5 Written questions
5 Matching questions
- Homeobox genes
- Programmed cell death
- 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 Genes that control the development of the body plan of an organism.
- c 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.
- d Observable characteristics of an organism.
- e Alternative term for apoptosis.
5 Multiple choice questions
- 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.
- Eukaryotic cell or organism having only one set of chromosomes. Denoted by n.
- The formation of an RNA molecule, using a length of DNA as a template and catalysed by RNA polymerase.
- The points where non-sister chromatids within a bivalent join, where they cross over.
- Refers to the location of cells with respect to the head end (anterior) or tail end (posterior) of the body.
5 True/False questions
Polypeptide → Large polymer molecule made of many amino acids joined by peptide bonds.
Hox clusters → Groups of homeobox genes. More complex organisms have more such groups, probably due to a mutation that duplicated them.
Genotype → Alleles present within cells of an individual, for a particular trait/characteristic.
Apoptosis → 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.
Nonsense mutation → A change in DNA sequence that introduces a premature stop codon within a DNA coding sequence.