Animal Anatomy lesson 9
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Questions and Answers

What is the estimated range of total number of animal species?

  • 500 million to 1 billion
  • 1.3 million to 10 million
  • 200 million to 500 million
  • 10 million to 200 million (correct)

    • What is the estimated range of total number of animal species?

  • 1.3 million to 10 million
  • 1.3 million to 200 million
  • 200 million to 500 million
  • 10 million to 200 million (correct)

    • What is the difference between true coelom and pseudocoelom?

    True coelom is a body cavity that forms from tissue derived from mesoderm whereas pseudocoelom is a body cavity formed from mesoderm and endoderm.

    Most animals can be categorized as having protostome or ______ development.

    <p>deuterostome</p> Signup and view all the answers

    Animal cells lack cell walls and are held together by extracellular structural proteins like ______.

    <p>collagen</p> Signup and view all the answers

    Which of the following is a characteristic of animal cells?

    <p>They lack cell walls</p> Signup and view all the answers

    What is the unique family of genes found only in animals that play important roles in the development of animal embryos?

    <p>Hox genes</p> Signup and view all the answers

    What are Hox genes and what is their importance in animal development?

    <p>Hox genes are a unique homeobox-containing family of genes found in animals that play an important role in the development of animal embryos.</p> Signup and view all the answers

    What is the function of the body cavity in animals?

    <p>Both A and B</p> Signup and view all the answers

    Animals share a unique homeobox-containing family of genes known as ______ genes that play important roles in the development of animal embryos.

    <p>Hox</p> Signup and view all the answers

    What are the two specialized types of cells found only in animals?

    <p>Nerve and muscle cells</p> Signup and view all the answers

    What are the two specialized types of cells found only in animals and what are their functions?

    <p>The two specialized types of cells found only in animals are nerve cells (for impulse conduction) and muscle cells (for movement).</p> Signup and view all the answers

    What is the difference between true coelom and pseudocoelom?

    <p>True coelom is a fully functional body cavity formed from mesoderm and endoderm, while pseudocoelom is not fully functional.</p> Signup and view all the answers

    What is the name of the multicellular stage formed after cleavage and gastrulation?

    <p>Blastula</p> Signup and view all the answers

    What is the purpose of a body cavity in animals?

    <p>A body cavity provides cushioning to organs and enables them to move independently of the outer body wall.</p> Signup and view all the answers

    The multicellular bodies of animals develop through cleavage and gastrulation, leading to the formation of a multicellular stage called the ______, and then the gastrula.

    <p>blastula</p> Signup and view all the answers

    Animals with true coelom are known as ______.

    <p>coelomates</p> Signup and view all the answers

    What is the significance of animal body plans and how are they categorized?

    <p>Animal body plans can be categorized into a relatively small number of major “body plans”, and animals can be categorized according to their symmetry and the organization of their tissues.</p> Signup and view all the answers

    What is the name of the unique homeobox-containing family of genes found in animals?

    <p>Hox genes</p> Signup and view all the answers

    What are the two specialized types of cells found only in animals?

    <p>Nerve cells and muscle cells</p> Signup and view all the answers

    Fossil evidence indicates that the two fundamentally different kinds of symmetry—radial and bilateral—have been present for at least ______ million years.

    <p>535</p> Signup and view all the answers

    What is the difference between protostome and deuterostome development?

    <p>Most animals can be categorized as having protostome or deuterostome development. In protostome development, the mouth is formed first from the blastopore, while in deuterostome development, the anus is formed first.</p> Signup and view all the answers

    What is the name of the body cavity found in most triploblastic animals?

    <p>Coelom</p> Signup and view all the answers

    How do animal bodies develop?

    <p>Through cleavage and gastrulation</p> Signup and view all the answers

    Acoelomates have a solid body without a ______.

    <p>body cavity</p> Signup and view all the answers

    What is the difference between protostome and deuterostome development?

    <p>In protostome development, the mouth develops before the anus, while in deuterostome development, the anus develops before the mouth.</p> Signup and view all the answers

    What is the estimated range of total number of animal species on Earth?

    <p>Estimates of total number of animal species range from 10 million to 200 million.</p> Signup and view all the answers

    What is the name of the taxon that includes animal phyla not in Deuterostomia?

    <p>Ecdysozoa</p> Signup and view all the answers

    What are large-scale analyses of multiple genes being conducted to understand?

    <p>Animal body plans</p> Signup and view all the answers

    What is the importance of molecular data in understanding animal phylogeny?

    <p>Molecular data has led to new views on animal phylogeny and large-scale analyses of multiple genes are being conducted to understand the diversity of animal body plans.</p> Signup and view all the answers

    Large-scale analyses of multiple genes are being conducted to understand the diversity of animal ______ plans.

    <p>body</p> Signup and view all the answers

    What are the two fundamentally different kinds of symmetry found in animals?

    <p>Radial and bilateral</p> Signup and view all the answers

    Study Notes

    • There are 1.3 million living species of animals, but estimates of total number of species range from 10 million to 200 million.
    • Animals are multicellular, ingestive heterotrophs with tissues that develop from embryonic layers.
    • Animal cells lack cell walls and are held together by extracellular structural proteins like collagen.
    • Animals have two specialized types of cells found only in animals: nerve cells for impulse conduction and muscle cells for movement.
    • The multicellular bodies of animals develop through cleavage and gastrulation, leading to the formation of a multicellular stage called the blastula, and then the gastrula.
    • Animals share a unique homeobox-containing family of genes known as Hox genes that play important roles in the development of animal embryos.
    • The history of animals spans more than half a billion years, with animal diversity increasing and punctuated by episodes of mass extinction.
    • Animal body plans can be categorized into a relatively small number of major “body plans”, and animals can be categorized according to their symmetry and the organization of their tissues.
    • Fossil evidence indicates that the two fundamentally different kinds of symmetry—radial and bilateral—have been present for at least 535 million years.
    • Most triploblastic animals possess a body cavity (a fluid- or air-filled space separating the digestive tract from the outer body wall) known as a coelom.- True coelom forms from tissue derived from mesoderm and surrounds internal organs.
    • Animals with true coelom are known as coelomates.
    • Pseudocoelom is a fully functional body cavity formed from mesoderm and endoderm.
    • Acoelomates have a solid body without a body cavity.
    • Body cavity provides cushioning to organs and enables them to move independently of outer body wall.
    • Most animals can be categorized as having protostome or deuterostome development.
    • Molecular data has led to new views on animal phylogeny.
    • Zoologists recognize about 35 animal phyla.
    • Ecdysozoa and Lophotrochozoa are two taxa that include animal phyla not in Deuterostomia.
    • Large-scale analyses of multiple genes are being conducted to understand the diversity of animal body plans.

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    Description

    How much do you know about the fascinating world of animals? Test your knowledge with our quiz that covers everything from animal cell structure to the history of animal diversity. Learn about animal body plans, symmetry, and the different types of body cavity. Explore the concept of coelomates, pseudocoelomates, and acoelomates. Discover the different stages of animal embryo development and the important role played by Hox genes. With over 20 questions, this quiz is sure to challenge

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