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Model Organisms
Model organisims
37
Biochemistry
Undergraduate 1
01/12/2013

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Term
What is a model organism?
Definition
A well established biological system
Term
What are the five characteristics of model organisms?
Definition
Rapid rate of development, easily genetically manipulated, short life span, readily available and large numbers of offspring
Term
Why don't we study humans instead of model organisms?
Definition
They do not fit the requirements of modern organsims
Term
What is the bacteria model organism?
Definition
Escherichia coli
Term
What charge is E. coli's cell wall?
Definition
Gram negative
Term
How frequently do E. coli divide?
Definition
Every 20 minutes
Term
What does homologue mean?
Definition
A gene related to another gene by descending from a common ancestor
Term
What does ortholouge mean?
Definition
Genes in different species that have come from a common ancestor
Term
What does paralogue mean?
Definition
Genes formed from a duplication in the genome
Term
What are the two yeast model organisms?
Definition
Saccharomyces cerevisiae and Schizosaccharomyces pombe
Term
How does the S. cerevisiae divide?
Definition
By budding
Term
How does the S. pombe divide?
Definition
By fission
Term
How often does the S. cerevisiae yeast divide?
Definition
Every 80 minutes
Term
What four things is the S. cerevisae yeast studied for?
Definition
Cell cycle, gene expression, DNA replication and repair and cell signalling
Term
What percentage of human diseases have ortholouges in yeast?
Definition
20%
Term
What three things is the S. pombe yeast studied for?
Definition
Cell cycle, chromosome dynamics and epigenetics
Term
What are the two other fungal models?
Definition
Neurospora crassa and Asperqillus nidulans
Term
What is the N. crassa fungus studied for?
Definition
Circadian rhythyms
Term
What is the plant model organism?
Definition
Arabidopsis thaliana
Term
What three things is the A.thaliana studied for?
Definition
Flowering, light sensitivity and plant development
Term
What are the two other plant model organisms?
Definition
Zea mays and Oryza sativa
Term
What is the Z. mays studied for?
Definition
Genetic mapping
Term
What is the O. sativa studied for?
Definition
Cereal biology
Term
What are the two insect model organisms?
Definition
Drosophila and Caenorhabditis elegans
Term
What is special about the Drosophilas genetics?
Definition
It has a giant polytene chromosome
Term
What three things is the Drosophila studied for?
Definition
Cell signalling, Development and Neurological diseases
Term
What is a disease model?
Definition
A mutant model organism that mimics phenotypic features of human disease
Term
What is the Drosophila a disease model for?
Definition
Spinal Muscular Atrophy (SMA)
Term
What percentage of the C. elegans genome has human orthologues?
Definition
40%
Term
What is the C. elegans studied for?
Definition
Aging and development
Term
What is the fish model organism?
Definition
Danio rerio
Term
What four things is the D. rerio studied for?
Definition
Vertebrate development, neurobiology, drug testing, human disease
Term
What is the mammal model organism?
Definition
Mus musuculus
Term
What is the M. musuculus studied for?
Definition
Human disease
Term
What are the two other vertebrate models?
Definition
Xenopus laevis and Rattus novegicus
Term
What two things is the X. laevis studied for?
Definition
Cell cycle and cell signalling
Term
What is the R. novegicus studied for?
Definition
Neurological and toxicity studies
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