Classifaction Flashcards

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1
Q

Define “taxonomy”

A

Classifying species into groups based on observed physical characteristics

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2
Q

List the levels of grouping organisms 8

A
  • Domain
  • Kingdom
  • Phylum
  • Class
  • Order
  • Family
  • Genus
  • Species
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3
Q

What is the usefulness of giving each species a Latin binomal name?

A

Scientists can communicate about organisms in a standard way that minimises confusion

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4
Q

What is the first word in an organism name?

A

The genus

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5
Q

What is the second word in an organism name?

A

The species

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6
Q

What is the problem with the early classification system? 3

A
  • Only based on observable phenotypes
  • Scientists don’t agree on relative importance of said phenotypes
  • Even organisms with similar phenotypes may not have similar DNA
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7
Q

What are the 5 kingdoms?

A
  • Prokaryotae
  • Protoctista
  • Fungi
  • Plantae
  • Animalia
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8
Q

What are the features of the prokaryotae kingdom?

A
  • Prokaryotes
  • Unicellular
  • No nucleus
  • Less than 5 micrometres
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9
Q

Name an example of the prokaryotae kingdom

A

Bacteria

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10
Q

What are the features of the protoctisa kingdom?

A
  • Eukaryotic cells
  • Usually live in water
  • Single celled/simple multicellular organisms
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11
Q

Name an example of the protoctisa kingdom

A

Algae

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12
Q

What are the features of the fungi kingdom?

A
  • Eukaryotic cells
  • Chitin cell wall
  • Saprotrophic : absorb substances from dead/decaying organism
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13
Q

Name 2 examples of the fungi kingdom

A
  • Mould

- Yeast

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14
Q

What are the features of the plantae kingdom?

A
  • Eukaryotic
  • Multicellular
  • Cellulose cell walls
  • Can photosynthesise
  • Autotrophic
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15
Q

Give an example of the plantae kingdom.

A

Flowering plants

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16
Q

What are the features of the animalia kingdom?

A
  • Eukaryotic
  • Multicellular
  • No cell walls
  • Heterotrophic
17
Q

What new system was proposed by Woese?

A
  • Three domain system - large superkingdoms above kingdoms in taxonomic hierachy
  • Prokaryotae kingdom was split into Archaea domain and Bacteria domain
  • All other organisms placed in Eukaryota domain
18
Q

Why were Prokaryoate classified into 2 new domains?

A

Molecular phylogeny suggested archaea and bacteria were more distinctly related genetically

19
Q

What is molecular phylogeny?

A

The study of evolutionary relationships and history between groups of organisms by looking at molecules e.g DNA/proteins similarity to see how closely related they are