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
Ch. 30 - An Introduction to Animals
Freeman8th EditionBiological ScienceISBN: 9780138276263
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Table of contents
- Ch. 1 - Biology: The Study of Life13
- Ch. 2 - Water and Carbon: The Chemical Basis of Life14
- Ch.3 - Protein Structure and Function10
- Ch.4 - Nucleic Acids and the RNA World10
- Ch. 5 - An Introduction to Carbohydrates10
- Ch. 6 - Lipids, Membranes, and the First Cells11
- Ch. 7 - Inside the Cell10
- Ch. 8 - Energy and Enzymes: An Introduction to Metabolism10
- Ch. 9 - Cellular Respiration and Fermentation11
- Ch. 10 - Photosynthesis12
- Ch. 11 - Cell-Cell Interactions12
- Ch. 12 - The Cell Cycle8
- Ch. 13 - Meiosis12
- Ch. 14 - Mendel and the Gene23
- Ch. 15 - DNA and the Gene: Synthesis and Repair15
- Ch. 16 - How Genes Work16
- Ch. 17 - Transcription, RNA Processing, and Translation16
- Ch. 18 - Control of Gene Expression in Bacteria16
- Ch. 19 - Control of Gene Expression in Eukaryotes12
- Ch. 20 - The Molecular Revolution: Biotechnology, Genomics, and New Frontiers15
- Ch. 21 - Genes, Development, and Evolution12
- Ch. 22 - Evolution by Natural Selection16
- Ch. 23 - Evolutionary Processes13
- Ch. 24 - Speciation15
- Ch. 25 - Phylogenies and the History of Life13
- Ch. 26 - Bacteria and Archaea15
- Ch. 27 - Diversification of Eukaryotes16
- Ch. 28 - Green Algae and Land Plants16
- Ch. 29 - Fungi18
- Ch. 30 - An Introduction to Animals9
- Ch. 31 - Protostome Animals15
- Ch. 32 - Deuterostome Animals17
- 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 Function17
- 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 Development16
- Ch. 48 - The Immune System in Animals16
- Ch. 49 - An Introduction to Ecology15
- Ch. 50 - Behavioral Ecology16
- Ch. 51 - Population Ecology16
- Ch. 52 - Community Ecology20
- Ch. 53 - Ecosystems and Global Ecology17
- Ch. 54 - Biodiversity and Conservation Ecology18
Chapter 30, Problem 2
Which of these familiar animals are all protostomes?
a. clams, shrimp, goldfish, leeches
b. butterflies, spiders, snakes, crabs
c. earthworms, snails, beetles, squid
Verified step by step guidance1
Identify the key characteristic of protostomes, which is that during embryonic development, the mouth develops before the anus.
Review each group of animals listed in the options to determine if they all exhibit this characteristic of protostomes.
Exclude any groups that contain deuterostomes, where the anus develops before the mouth. For example, vertebrates like fish and snakes are deuterostomes.
Focus on invertebrate groups, as most protostomes are invertebrates, including mollusks, annelids, and arthropods.
Confirm that the correct option only includes animals that are classified as protostomes, such as earthworms (annelids), snails (mollusks), beetles (arthropods), and squid (mollusks).
Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Protostomes
Protostomes are a major group of animals characterized by their embryonic development. In protostomes, the mouth develops from the first opening in the embryo, known as the blastopore, while the anus forms later. This group includes diverse organisms such as mollusks, annelids, and arthropods, which exhibit a wide range of body plans and adaptations.
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Overview of Animals - 2
Animal Classification
Animal classification is the systematic categorization of animals based on shared characteristics and evolutionary relationships. It involves grouping animals into taxa such as phyla, classes, and orders. Understanding the classification helps in identifying which animals belong to the protostome group and differentiating them from deuterostomes, where the anus develops first.
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Examples of Protostomes
Common examples of protostomes include clams, shrimp, and earthworms. These animals exhibit key features such as a coelom (body cavity) and segmented bodies in some cases. Recognizing these examples is crucial for answering questions about which animals belong to the protostome category, as it helps in distinguishing them from deuterostomes like vertebrates.
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