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Terms in this set (37)
Describe the characteristics all animals have in common
Most ingest their food
Lack cell walls
Tissues develop from embryonic layers
are basal mammals that lay eggs instead of giving birth to live young
born incompletely developed and are typically carried and suckled in a pouch on the mother's belly.
Placenta surrounding the fetus is made up of a single maternal layer (i.e.endometrium), an outer embryonic layer (i.e. chorion), and an inner embryonic layer.
A graduate student finds an organism in a pond and thinks it is a freshwater sponge. A postdoctoral student thinks it looks more like an aquatic fungus. How can they decide whether it is an animal or a fungus?
Look for cell walls under a microscope.
Which of the following is (are) unique to animals?
nervous system signal conduction and muscular movement
Both animals and fungi are heterotrophic. What distinguishes animal heterotrophy from fungal heterotrophy is that most animals derive their nutrition by _____.
What do animals ranging from corals to monkeys have in common?
presence of Hox genes
Which of the following is radially symmetrical?
Which of the following is NOT a characteristic of all animals?
They have tissues, organs, and organ systems.
An important trend in animal evolution was cephalization. An animal is said to show cephalization when it _____.
has an aggregation of sensory neurons at the anterior end
Which of the following animals does NOT have a body cavity?
During embryological development, the anus forms before the mouth in _____.
While looking at some seawater through your microscope, you spot the egg of an unknown animal. Which of the following tests could you use to determine whether the developing organism is a protostome or a deuterostome? See whether the embryo _____.
exhibits spiral cleavage or radial cleavage
Which of the following is a feature of the tube-within-a-tube body plan in most animal phyla?
The mouth and anus form the ends of the inner tube.
What was an early selective advantage of a coelom in animals? A coelom _____.
contributed to a hydrostatic skeleton, allowing greater range of motion
An organism that exhibits cephalization probably also _____.
is bilaterally symmetrical
A land snail, a clam, and an octopus all share
Which phylum is characterized by animals that have a segmented body?
Which of the following combinations of phylum and description is incorrect?
Porifera-gastrovascular cavity, coelom present
Select the correct statement(s) describing nematodes.
Some nematodes play important roles in nutrient cycling.
Nematodes lack a circulatory system and circular body wall muscles.
Which of the following is a characteristic of cnidarians?
In terms of food capture, which sponge cell is most similar to the cnidocyte of a cnidarian?
Which of the following is characteristic of the phylum Platyhelminthes?
They are dorsoventrally flattened.
Members of the phylum Mollusca _____.
are soft-bodied and often covered by a shell
Which of the following is true of annelids?
They perform gas exchange across their skin.
A marine biologist dredges up a small animal from the bottom of the ocean. It is uniformly segmented, with short, stiff appendages and soft, flexible skin. It has a complete digestive system and a closed circulatory system, plus multiple true coeloms. Based on this, you determine that the animal must be a(n) _____.
You find what you believe is a new species of animal. Which of the following characteristics would enable you to argue that it is more closely related to a flatworm than it is to a roundworm?
It has no coelom.
Against which structure do the circular and longitudinal muscles of annelids work?
While sampling marine plankton in a lab, a student encounters large numbers of fertilized eggs. The student rears some of the eggs in the laboratory for further study and finds that the blastopore becomes the mouth. The embryo develops into a trochophore larva and eventually has a true coelom. These eggs probably belonged to a(n) _____.
Which characteristic is shared by cnidarians and flatworms?
a digestive system with a single opening
Nematodes and arthropods both _____.
grow by shedding their exoskeleton
All arthropods _____.
2) have jointed appendages
4) have segmented bodies
5) have an exoskeleton or cuticle
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. The organism could potentially be a crab, a shrimp, a barnacle, or a bivalve. The presence of which of the following structures would allow for the most certain identification of the organism?
Which of the following statements about deuterostomes is true?
All deuterostomes are triploblastic and have three tissue layers.
All deuterostomes have a similar pattern of early embryonic development.
All deuterostomes have a coelom.
Chordates are defined by the presence of four morphological traits:
a notochord, a dorsal nerve cord, pharyngeal gill slits, and a tail behind the anus.
Which structure can be used for feeding and gas exchange?
Pharyngeal gill slit
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