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Questions and Answers
Which of the following statements about nematodes and arthropods are true? (Select all that apply)
Which of the following statements about nematodes and arthropods are true? (Select all that apply)
- Some nematodes are parasitic on humans. (correct)
- Nematodes possess a closed circulatory system.
- Both nematodes and arthropods must molt in order to increase in size. (correct)
- Nematodes are acoelomate, whereas arthropods are coelomate.
- Arthropods are named for their jointed appendages. (correct)
- Both nematodes and arthropods possess an external covering, or cuticle. (correct)
- The cuticle in nematodes lengthens as the animal grows.
- Both nematodes and arthropods have segmented body plans.
- Arthropods possess an open circulatory system. (correct)
Who do you work for as an entomologist in charge of neonicotinoids?
Who do you work for as an entomologist in charge of neonicotinoids?
- Environmental Protection Agency (correct)
- Food and Drug Administration
- Department of Health and Human Services
- Department of Agriculture
How are varroa mites harmful to bees?
How are varroa mites harmful to bees?
They spread pathogens.
Which individual would most likely be against a ban on neonicotinoids?
Which individual would most likely be against a ban on neonicotinoids?
What does Syngenta likely think is the best option to prevent more honeybee deaths?
What does Syngenta likely think is the best option to prevent more honeybee deaths?
Which body system should a scientist studying neonicotinoids on honeybees focus on?
Which body system should a scientist studying neonicotinoids on honeybees focus on?
Which of the following would most likely cause Turritopsis dohrnii to undergo cellular transdifferentiation?
Which of the following would most likely cause Turritopsis dohrnii to undergo cellular transdifferentiation?
Which of the following is the sexual stage of a hydrozoan?
Which of the following is the sexual stage of a hydrozoan?
You observe a species of hydrozoan with many stolons. What will these stolons become?
You observe a species of hydrozoan with many stolons. What will these stolons become?
What have you discovered if you find an on-off switch for the BRAF oncogene?
What have you discovered if you find an on-off switch for the BRAF oncogene?
If Shin Kubota's hunch is correct, where does the key to Turritopsis dohrnii immortality lie?
If Shin Kubota's hunch is correct, where does the key to Turritopsis dohrnii immortality lie?
How are sponges most accurately described?
How are sponges most accurately described?
Some species of rotifers consist solely of females. Their method of reproduction is described as _____.
Some species of rotifers consist solely of females. Their method of reproduction is described as _____.
Which of the following animal groups is entirely aquatic?
Which of the following animal groups is entirely aquatic?
Which clade in the phylum Cnidaria includes 'jellies'?
Which clade in the phylum Cnidaria includes 'jellies'?
Members of the phylum Mollusca are described as _____.
Members of the phylum Mollusca are described as _____.
A shared derived characteristic for members of the arthropod subgroup that includes spiders would be the presence of _____.
A shared derived characteristic for members of the arthropod subgroup that includes spiders would be the presence of _____.
Annelids have an open circulatory system.
Annelids have an open circulatory system.
Which of the following is characteristic of the phylum Platyhelminthes?
Which of the following is characteristic of the phylum Platyhelminthes?
How many of the following are characteristics of at least some members of the phylum Cnidaria? 1. A gastrovascular cavity 2. A polyp stage 3. A medusa stage 4. Cnidocytes 5. A pseudocoelom
How many of the following are characteristics of at least some members of the phylum Cnidaria? 1. A gastrovascular cavity 2. A polyp stage 3. A medusa stage 4. Cnidocytes 5. A pseudocoelom
The organ(s) of respiratory gas exchange in oligochaetes is (are)
The organ(s) of respiratory gas exchange in oligochaetes is (are)
The excretory organs of annelids are _____.
The excretory organs of annelids are _____.
The water vascular system of echinoderms functions in _____.
The water vascular system of echinoderms functions in _____.
A radula is present in members of which clade(s)?
A radula is present in members of which clade(s)?
In a tide pool, a student encounters an organism with a hard outer covering that contains much calcium carbonate, an open circulatory system, and gills. What structure would allow for the most certain identification of the organism?
In a tide pool, a student encounters an organism with a hard outer covering that contains much calcium carbonate, an open circulatory system, and gills. What structure would allow for the most certain identification of the organism?
Which phylum is characterized by animals that have a segmented body?
Which phylum is characterized by animals that have a segmented body?
A land snail, a clam, and an octopus all share _____.
A land snail, a clam, and an octopus all share _____.
Which of the following is a characteristic of cnidarians?
Which of the following is a characteristic of cnidarians?
The animal phylum most like the protists that gave rise to the animal kingdom is _____.
The animal phylum most like the protists that gave rise to the animal kingdom is _____.
What evidence indicates that vertebrates are more closely related to echinoderms than any other invertebrate phyla?
What evidence indicates that vertebrates are more closely related to echinoderms than any other invertebrate phyla?
Which of the following is a characteristic of nematodes?
Which of the following is a characteristic of nematodes?
Select all correct examples of invertebrates that combine morphological simplicity with features of great complexity.
Select all correct examples of invertebrates that combine morphological simplicity with features of great complexity.
Select the correct statement(s) about invertebrate taxa.
Select the correct statement(s) about invertebrate taxa.
Which of the following are thought to be most closely related to humans?
Which of the following are thought to be most closely related to humans?
A terrestrial animal species is discovered with the following larval characteristics: exoskeleton, system of tubes for gas exchange, and modified segmentation. What should be predicted about the adults of this species?
A terrestrial animal species is discovered with the following larval characteristics: exoskeleton, system of tubes for gas exchange, and modified segmentation. What should be predicted about the adults of this species?
In terms of food capture, which sponge cell is most similar to the cnidocyte of a cnidarian?
In terms of food capture, which sponge cell is most similar to the cnidocyte of a cnidarian?
Study Notes
Ecdysozoa and Key Characteristics
- Nematodes and arthropods are the largest phyla within the ecdysozoan group.
- Nematodes and arthropods must molt to grow; this process allows for increases in size.
- Arthropods feature an open circulatory system, while nematodes are acoelomate and possess a closed circulatory system.
- Nematodes can be parasitic, causing harm to humans.
- Both phyla possess an external covering called a cuticle and arthropods are distinguished by their jointed appendages.
Neonicotinoids and Regulatory Bodies
- The Environmental Protection Agency (EPA) oversees the assessment of neonicotinoids in the U.S.
- Cotton farmers are typically opposed to a ban on neonicotinoids, which they rely on for crop production.
Honeybee Health and Threats
- Varroa mites are detrimental to bees primarily because they spread pathogens that can lead to diseases.
- Syngenta advocates for killing varroa mites as a strategy to mitigate honeybee deaths.
Hydrozoans and Related Observations
- The sexual stage of a hydrozoan is known as medusa.
- Observing a hydrozoan species with numerous stolons indicates these will develop into polyps.
Cancer Research Insights
- The discovery of an on-off switch for the BRAF oncogene relates to MiRNA, a type of regulatory RNA.
Sponges and Rotifers
- Sponges function as filter feeders, filtering water to extract nutrients.
- Certain species of rotifers reproduce exclusively through parthenogenesis, a form of asexual reproduction.
Animal Phyla Characteristics
- Echinodermata represents the only wholly aquatic animal group.
- Characteristics of the phylum Cnidaria include the presence of a gastrovascular cavity and a polyp stage during their lifecycle.
- Annelids perform gas exchange through their skin, unlike other invertebrates with different respiratory systems.
- Members of Mollusca, like snails and clams, share traits such as possessing a mantle and often a hard shell.
- The arthropod subgroup, which includes spiders, is characterized by the presence of chelicerae.
Biological Relationships
- Evidence, such as shared DNA sequences, suggests vertebrates are more closely related to echinoderms than other invertebrate phyla.
- The phylum Porifera is notably similar to the ancestral protists that gave rise to the animal kingdom.
Nematodes and Annelids
- Nematodes possess only longitudinal muscles, differentiating them from other animal groups.
- The excretory organs of annelids are known as metanephridia.
Miscellaneous Characteristics
- Echinoderms utilize a water vascular system for locomotion and feeding.
- The presence of a mantle is a definitive characteristic of organisms like bivalves and gastropods.
- Tapeworms lack both a mouth and a gastrovascular cavity, while ectoprocts have no distinct head.
- Sea stars are considered to be closely related to humans within the animal kingdom.
Identifying Characteristics
- A terrestrial species with a larval structure suggesting tubular gas exchange and modified segmentation likely features an open circulatory system as an adult.
- Choanocytes in sponges function similarly to cnidocytes, facilitating food capture through filtration.
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Description
Test your knowledge on nematodes and arthropods in this quiz focused on Biology Chapter 33. Evaluate your understanding of the characteristics, differences, and biological classifications of these significant ecdysozoan phyla. Select true statements about their anatomy and ecology.
