6.22 Classification and the three domains
6 exam questions worth 10 marks. Write your answer, open the mark scheme, then give yourself the marks you earned. Your answers are saved on this device.
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List the levels of classification in the Linnaean system, from largest to smallest.
Mark scheme
kingdom, phylum, class, order, family, genus, species (2) allow 1 mark for one error
Model answer
Kingdom, phylum, class, order, family, genus, species.
The scientific name of the wolf is Canis lupus.
What do the two parts of the name tell you?
Mark scheme
- Canis: the genus (1)
- lupus: the species (1)
Model answer
Canis is the genus and lupus is the species.
Which domain contains plants, animals and fungi?
Choose one answer.
Correct Not quite: the answer is Eukaryota
Mark scheme
C: Eukaryota
Model answer
C: Eukaryota.
Explain why the three-domain system was introduced.
Mark scheme
- chemical / genetic / DNA analysis showed (1)
- some organisms (archaea) were very different from bacteria / relationships different from appearance (1)
Model answer
Chemical and genetic analysis showed that some organisms thought to be bacteria (archaea) are very different from true bacteria, so Woese proposed three domains.
Give two developments that led to new models of classification.
Mark scheme
Any two from:
- better microscopes / seeing internal structures (1)
- understanding of biochemical processes (1)
- DNA / genetic analysis (1)
Model answer
Better microscopes that showed internal structures, and DNA analysis.
What does an evolutionary tree show?
Mark scheme
how closely related organisms are / their common ancestors
Model answer
How organisms are related to each other through common ancestors.
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