Textbook Question
Which synapomorphy (shared, derived trait) distinguishes animals as a monophyletic group, distinct from choanoflagellates?
a. Multicellularity
b. Coloniality
c. Heterotrophy
d. Movement
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Ch. 30 - An Introduction to Animals
Freeman7th EditionBiological ScienceISBN: 9783584863285
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Table of contents
- Ch. 1 - Biology: The Study of Life11
- Ch. 2 - Water and Carbon: The Chemical Basis of Life10
- Ch.3 - Protein Structure and Function11
- Ch.4 - Nucleic Acids and the RNA World10
- Ch. 5 - An Introduction to Carbohydrates10
- Ch. 6 - Lipids, Membranes, and the First Cells10
- Ch. 7 - Inside the Cell10
- Ch. 8 - Energy and Enzymes: An Introduction to Metabolism10
- Ch. 9 - Cellular Respiration and Fermentation16
- Ch. 10 - Photosynthesis14
- Ch. 11 - Cell-Cell Interactions14
- Ch. 12 - The Cell Cycle12
- Ch. 13 - Meiosis13
- Ch. 14 - Mendel and the Gene32
- Ch. 15 - DNA and the Gene: Synthesis and Repair8
- Ch. 16 - How Genes Work35
- Ch. 17 - Transcription, RNA Processing, and Translation16
- Ch. 18 - Control of Gene Expression in Bacteria19
- Ch. 19 - Control of Gene Expression in Eukaryotes17
- Ch. 20 - The Molecular Revolution: Biotechnology, Genomics, and New Frontiers23
- Ch. 21 - Genes, Development, and Evolution13
- Ch. 22 - Evolution by Natural Selection17
- Ch. 23 - Evolutionary Processes13
- Ch. 24 - Speciation15
- Ch. 25 - Phylogenies and the History of Life13
- Ch. 26 - Bacteria and Archaea17
- Ch. 27 - Diversification of Eukaryotes19
- Ch. 28 - Green Algae and Land Plants18
- Ch. 29 - Fungi19
- Ch. 30 - An Introduction to Animals9
- Ch. 31 - Protostome Animals20
- Ch. 32 - Deuterostome Animals19
- Ch. 33 - Viruses16
- Ch. 34 - Plant Form and Function16
- Ch. 35 - Water and Sugar Transport in Plants16
- Ch. 36 - Plant Nutrition13
- Ch. 37 - Plant Sensory Systems, Signals, and Responses16
- Ch. 38 - Flowering Plant Reproduction and Development16
- Ch. 39 - Animal Form and Function16
- Ch. 40 - Water and Electrolyte Balance in Animals16
- Ch. 41 - Animal Nutrition16
- Ch. 42 - Gas Exchange and Circulation16
- Ch. 43 - Animal Nervous Systems16
- Ch. 44 - Animal Sensory Systems16
- Ch. 45 - Animal Movement11
- Ch. 46 - Chemical Signals in Animals16
- Ch. 47 - Animal Reproduction and Development18
- Ch. 48 - The Immune System in Animals16
- Ch. 49 - An Introduction to Ecology16
- Ch. 50 - Behavioral Ecology16
- Ch. 51 - Population Ecology16
- Ch. 52 - Community Ecology20
- Ch. 53 - Ecosystems and Global Ecology16
- Ch. 54 - Biodiversity and Conservation Ecology16
Chapter 30, Problem 2
In a tube-within-a-tube body plan, what is the interior tube derived from?
a. Ectoderm
b. Mesoderm
c. The coelom
d. Endoderm
Verified step by step guidance1
Understand the concept of a tube-within-a-tube body plan, which is a common structural organization in animals where the body is organized into two main tubes: an outer body wall and an inner digestive tract.
Identify the germ layers formed during embryonic development: ectoderm, mesoderm, and endoderm. Each layer gives rise to different tissues and organs in the body.
Recall that the endoderm is the innermost germ layer and is responsible for forming the lining of the digestive tract and associated structures.
Recognize that in the tube-within-a-tube body plan, the interior tube, which is the digestive tract, is derived from the endoderm.
Conclude that the correct answer to the problem is that the interior tube is derived from the endoderm.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Tube-within-a-tube body plan
The tube-within-a-tube body plan is a fundamental structural organization in many animals, where the body consists of an outer tube (body wall) and an inner tube (digestive tract). This arrangement allows for efficient digestion and nutrient absorption, and is characteristic of bilaterally symmetrical organisms, including humans.
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Echinoderms
Endoderm
The endoderm is one of the three primary germ layers formed during embryonic development. It is the innermost layer and gives rise to the interior linings of the digestive and respiratory systems, including the gut tube. Understanding the role of the endoderm is crucial for identifying the origin of the inner tube in the tube-within-a-tube body plan.
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Embryonic germ layers
Embryonic germ layers are the three layers formed during early embryogenesis: ectoderm, mesoderm, and endoderm. Each layer differentiates into specific tissues and organs. The ectoderm forms the skin and nervous system, the mesoderm forms muscles and the circulatory system, and the endoderm forms the digestive and respiratory systems. Recognizing these layers helps in understanding the development of body structures.
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Related Practice
Textbook Question
True or false?
New major animal body plans have continued to evolve since the Cambrian about 550 million years ago.
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Textbook Question
Which of these characteristics does not apply to cnidarians?
a. Are diploblastic
b. Possess a gastrovascular cavity with one opening
c. Undergo metamorphosis
d. Have a central nervous system
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Textbook Question
Why is it ecologically significant that animals are heterotrophic and multicellular?
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