Chpt 32 Hmwk
Which of the following animals does NOT have a body cavity? nematode flatworm mouse clam earthworm
flatworm
Characterize a prototsome
Mouth from blastopore Spiral, determinate cleavage coelom from solid masses of mesoderm triploblastic
All animals can trace their lineage to a common ancestor that lived in the _____. Neoproterozoic era Jurassic Cenozoic Pliocene Devonian
Neoproteozoic era
What animals have bilateral symmetry?
Snake, bobcat, octopus, and a turtle
Animal tissues develop from embryonic germ layers. Triploblastic animals have three germ layers (ectoderm, mesoderm, and endoderm) and three basic body plans related to body cavities (acoelomate, pseudocoelomate, and coelomate). Select the three statements that are true. To review the germ layers and the terminology associated with body cavities, see the Hints. A diploblast has no mesoderm. In a pseudocoelomate, the tissue lining the inner side of the body cavity arises from the same germ layer as the muscles. In a coelomate, the tissue lining the inner side of the body cavity arises from the same germ layer as the tissue lining the outer side of the body cavity. In a coelomate, the tissue lining the inner side of the body cavity arises from the same germ layer as the lining of the digestive tract. A pseudocoelom has the same functions as a true coelom. The digestive tract of a coelomate functions as a coelom. An acoelomate triploblast has no endoderm.
A diploblast has no mesoderm In a coelomate, the tissue lining the inner side of the body cavity arises from the same germ layer as the tissue lining the outer side of the body cavity A pseudocoelom has the same functions as a true coelom
The earliest ancestors of about half of all extant animal phyla can be traced back to the _____ explosion. Carboniferous Jurassic Pleistocene Cambrian Devonian
Cambrian
Which feature of deuterostome development explains the formation of identical human twins? Deuterostomes have indeterminate development. In deuterostomes, the blastopore becomes the anus. Deuterostomes have radial cleavage.
Desuterostomes have indeterminate development
Select the correct statement(s) about animal body plans. Select all that apply. Development in all animals is determined by the unique family of Hox genes (or other similar homeobox genes). All triploblastic animals possess a coelom. In both protostomes and deuterostomes, the blastopore develops into the mouth.
Development in all animals is determined by the unique family of Hox genes (or other similar homeobox genes)
What animals have radial symmetry?
Jelly and hydra
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? See if it is a eukaryote or prokaryote. Look for cell walls under a microscope. Determine whether it is unicellular or multicellular. Figure out whether it is autotrophic or heterotrophic. See if it reproduces sexually.
Look for cell walls under a microscope
Which of the following is NOT a characteristic of all animals? They are all multicellular. They are heterotrophic. They are eukaryotes. They have tissues, organs, and organ systems. They ingest their food.
They have tissues, organs, and organ systems
Which of the following is radially symmetrical? a doughnut a dog a spoon a submarine sandwich an automobile
a doughnut
Which of the following statements is correct? Most animal phyla belong to the clade Radiata. Eumetazoans have three embryonic tissue layers. The origin of all extant animal phyla can be traced to the Cambrian explosion. Sponges are diploblastic animals. All animals share a common ancestor.
all animals share a common ancestor
Characterize a deuterostome
anus from blastopore radial, indeterminate cleavage coelom from folds of archenteron triploblastic
What type of symmetry do sponges have?
asymmetry
During embryological development, the anus forms before the mouth in _____. slugs earthworms arthropods humans flatworms
humans
