5 Written questions
5 Matching questions
- Spindle fibres
- a A length of DNA that codes for one (or more) polypeptides/proteins. Some may code for RNA or regulate other genes.
- b An alternative version of a gene carrying sequence differences.
- c The formation of an RNA molecule, using a length of DNA as a template and catalysed by RNA polymerase.
- d Characteristic in which the allele responsible is only expressed in the phenotype if there is no dominant allele present.
- 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
- The DNA strand that is used for assembly of mRNA by RNA polymerase using base-pairing rules. Complementary to the message sequence.
- 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.
- A change in DNA sequence that leads to a change in the amino acid sequence coded for by a gene.
- 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.
- Observable characteristics of an organism.
5 True/False questions
transfer RNA → 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.
Insertion/deletion mutation → A change in DNA sequence that introduces a premature stop codon within a DNA coding sequence.
Genetic variation → Variation of genetic information in a gene pool.
Degenerate → A length of DNA that codes for one (or more) polypeptides/proteins. Some may code for RNA or regulate other genes.
Heterozygous → Eukaryotic cell or organism that has two different alleles for a specific gene.