Questions and Answers
What is the estimated range of total number of animal species?
10 million to 200 million
What is the estimated range of total number of animal species?
10 million to 200 million
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.
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Animal cells lack cell walls and are held together by extracellular structural proteins like ______.
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Which of the following is a characteristic of animal cells?
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What is the unique family of genes found only in animals that play important roles in the development of animal embryos?
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What are Hox genes and what is their importance in animal development?
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What is the function of the body cavity in animals?
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Animals share a unique homeobox-containing family of genes known as ______ genes that play important roles in the development of animal embryos.
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What are the two specialized types of cells found only in animals?
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What are the two specialized types of cells found only in animals and what are their functions?
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What is the difference between true coelom and pseudocoelom?
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What is the name of the multicellular stage formed after cleavage and gastrulation?
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What is the purpose of a body cavity in animals?
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The multicellular bodies of animals develop through cleavage and gastrulation, leading to the formation of a multicellular stage called the ______, and then the gastrula.
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Animals with true coelom are known as ______.
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What is the significance of animal body plans and how are they categorized?
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What is the name of the unique homeobox-containing family of genes found in animals?
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What are the two specialized types of cells found only in animals?
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Fossil evidence indicates that the two fundamentally different kinds of symmetry—radial and bilateral—have been present for at least ______ million years.
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What is the difference between protostome and deuterostome development?
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What is the name of the body cavity found in most triploblastic animals?
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How do animal bodies develop?
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Acoelomates have a solid body without a ______.
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What is the difference between protostome and deuterostome development?
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What is the estimated range of total number of animal species on Earth?
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What is the name of the taxon that includes animal phyla not in Deuterostomia?
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What are large-scale analyses of multiple genes being conducted to understand?
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What is the importance of molecular data in understanding animal phylogeny?
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Large-scale analyses of multiple genes are being conducted to understand the diversity of animal ______ plans.
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What are the two fundamentally different kinds of symmetry found in animals?
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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.
