14 Questions
What is a characteristic feature of all animals?
Multicellularity
Which of the following is true about animal nutrition?
Herbivores consume autotrophs
What holds cells of animal bodies together?
Extracellular frames of structural proteins
What is the main reason for the active movement of animals?
Evolution of nerve and muscle tissues
Which group of animals consume both autotrophs and heterotrophs?
Omnivores
Animals lack rigid cell walls, unlike which group of organisms?
Plants
What is a characteristic that is shared by all animals?
Multicellularity and heterotrophy
Which feature characterizes only some types of animals?
Possession of a body cavity
What type of symmetry is exhibited by jellyfish, sea anemones, and corals?
Radial symmetry
What is the fundamental difference between radial and bilateral symmetry?
Bilateral symmetry has right and left halves that are mirror images, while radial symmetry lacks this feature.
What type of reproduction do most animals engage in?
Sexual reproduction through meiotic division
What do animal eggs lack in comparison to sperm?
Flagella
What is the term for the series of mitotic divisions that produce a ball of cells after fertilization?
Cleavage
What is the term for the structural and functional units into which cells of most animals are organized?
Tissues
Study Notes
Characteristics of Animals
- A characteristic feature of all animals is the ability to move, which is not seen in plants or fungi.
Animal Nutrition
- Animals are heterotrophs, meaning they obtain energy by consuming other organisms or organic matter.
Cell Structure
- Cells of animal bodies are held together by collagen, a type of protein.
- Unlike plants, animals lack rigid cell walls.
Movement and Locomotion
- The main reason for the active movement of animals is to find food, escape predators, and reproduce.
Omnivores
- Omnivores are a group of animals that consume both autotrophs (plants) and heterotrophs (other animals).
Symmetry
- Jellyfish, sea anemones, and corals exhibit radial symmetry, where body parts are arranged around a central axis.
- Radial symmetry is different from bilateral symmetry, where body parts are arranged on both sides of a central axis, like in humans.
Reproduction
- Most animals engage in sexual reproduction, where an egg and sperm fuse to form a zygote.
- Animal eggs lack flagella, which are found in sperm, allowing them to move.
Development
- The term for the series of mitotic divisions that produce a ball of cells after fertilization is cleavage.
- The term for the structural and functional units into which cells of most animals are organized is tissue.
Test your knowledge about the general features of animals, evolution of animal body plans, animal phylogeny, and the classification of animals lacking specialized tissues or with true tissues.
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