AQA GCSE Biology

Classification

AQA GCSE Biology revision on Classification. Aligned to the AQA GCSE Biology 8461 specification. This bank has 25 practice questions on this topic.

Sample questions (3 of 25)

  1. Question 1

    Which taxonomic level is used as the first part of a binomial name in the Linnaean system?

    • A) Family group
    • B) Genus name
    • C) Species rank
    • D) Phylum level
    Show answer

    Answer: Genus name

    The binomial system, developed by Carl Linnaeus, uses a two-part Latin name. The first part represents the genus to which the organism belongs, while the second part is the specific species name.

  2. Question 2

    Which domain contains organisms that possess unused sections of DNA within their genes?

    • A) Eukaryota
    • B) Bacteria
    • C) Archaea
    • D) Prokarya
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    Answer: Eukaryota

    Carl Woese's three-domain system classifies life into Archaea, Bacteria, and Eukaryota. Eukaryotes are unique among these because their DNA contains 'junk' or non-coding sections known as introns, which are absent in the prokaryotic domains.

  3. Question 3

    What is the primary reason for the development of the three-domain system by Carl Woese?

    • A) New fossil data
    • B) Biochemical evidence
    • C) Visible morphology
    • D) Habitat analysis
    Show answer

    Answer: Biochemical evidence

    As technology improved, scientists were able to study the biochemistry of organisms at a molecular level. Carl Woese used evidence from ribosomal RNA sequences to show that some 'bacteria' were genetically distinct, leading to the classification of Archaea.

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