18 Questions
Which of the following characteristics is unique to most animals compared to other eukaryotes?
Absence of an extracellular matrix to provide structural support
Which type of tissue in animals allows for rapid response to environmental changes?
Nervous tissue
Which germ layer in animal embryonic development gives rise to the nervous system and sensory organs?
Ectoderm
Which type of symmetry is most common in the animal kingdom?
Bilateral symmetry
Which of the following is a key characteristic that distinguishes animal cells from plant cells?
Lack of an extracellular matrix
What is the primary function of the Hox genes found in most animals?
To pattern the body axis during embryonic development
Which of the following is a characteristic used to classify animals based on their body plans?
Number of germ layers
Which group of animals is characterized by the absence of specialized tissues or organs?
Parazoa
Which of the following is a characteristic that distinguishes the Eumetazoa from the Parazoa?
Possession of more than one type of tissue and organs
Which of the following groups of animals is characterized by radial symmetry?
Cnidaria and Echinodermata
Which of the following is a group of single-celled organisms that is considered the closest living relative of animals?
Choanoflagellata
Which of the following statements about germ layers is true?
The number of germ layers varies among different animal groups
Which of the following is NOT a characteristic feature of animals?
Autotrophy
Which of the following germ layers gives rise to the nervous system and sensory organs in animals?
Ectoderm
Which of the following types of symmetry is exhibited by organisms such as jellyfish and sea anemones?
Radial symmetry
Which of the following body plans is characteristic of organisms such as flatworms and roundworms?
Bilateral symmetry
Which of the following statements about animal reproduction is NOT true?
All animals reproduce asexually.
Which of the following tissues is unique to animals and plays a crucial role in their movement?
Muscle tissue
Explore the evolution of animals from choanoflagellate-like ancestors and the closest living relatives of animals, as well as traditional classification based on body plans. Discover the similarities between choanoflagellates and sponge choanocytes.
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