Bio1331 Animals - Evolution - Origins Of Invertebrates (Lecture One)

19 Questions | Total Attempts: 239

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Bio1331 Animals - Evolution - Origins Of Invertebrates (Lecture One)

You should be able to: Demonstrate understanding of the proposed origins of the invertebrates


Questions and Answers
  • 1. 
    What is the simple definition of an invertebrate?
    • A. 

      An animal without a backbone

    • B. 

      An animal with a backbone

    • C. 

      An animal without a notochord

    • D. 

      An animal with a notochord

  • 2. 
    What evidence can be used to provide clues to the relatedness of a species to others?e.g. using molecules and gene sequences
  • 3. 
    Animals are ________, because they digest outside nutrients and have a gut.
  • 4. 
    Name the putative animal ancestor.
  • 5. 
    Which of the following is true for the putative animal ancestor Choanoflagellate?You may choose more than one.
    • A. 

      Has actin collar for prey capture

    • B. 

      Has flagellum for movement

    • C. 

      Is multicellular

    • D. 

      Is single-cellular but exists in colonies

    • E. 

      Has a cell wall

    • F. 

      Has capsule similar to bacteria

  • 6. 
    When did the choanoflagellates arise?
    • A. 

      >600 million years ago

    • B. 

      >600 thousand years ago

    • C. 

      >1 billion years ago

    • D. 

      >1 million years ago

  • 7. 
    Complete the following sentence:Choanoflagellates are morphologically similar to ________ cells found in sponges, associated with assisting water flow through the sponge.
  • 8. 
    Complete the following sentence:The choanoflagellate M. brevicollis shares animal receptor ___________ genes associated with intercellular signalling.
  • 9. 
    Complete the following sentence:Animals are _________, meaning they are related to, descending from or derived from one source.
  • 10. 
    Name the ancient life form resembling jellyfish, corals and worms that appeared approx 610 million years ago, often described as a 'failed experiment' in multicellular life.
  • 11. 
    Complete the following sentence:The _________ explosion was a period of rapid evolution of novel morphologies within a few million years.
  • 12. 
    True or False?Marine environments have salinity levels of approximately 3.5%.
    • A. 

      True

    • B. 

      False

  • 13. 
    Which habitat type harbours the greatest biodiversity and abundance of invertebrates?
    • A. 

      Marine

    • B. 

      Freshwater

    • C. 

      Terrestrial

    • D. 

      Salt marshes and mangrove swamps

    • E. 

      Estuaries

  • 14. 
    Complete the following sentence:A _______ is an immature life stage that differs from the adult.
  • 15. 
    Complete the following sentence:___________ is when characteristics of one life stage improve the ability for one activity but reduce performance in others.
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