Mastering Bio Ch. 32

Which of the following is NOT a characteristic of all animals? They are heterotrophic. They are eukaryotes. They have tissues, organs, and organ systems. They ingest their food. They are all multicellular.

Both animals and fungi are heterotrophic. What distinguishes animal heterotrophy from fungal heterotrophy is that most animals derive their nutrition by _____. consuming living, rather than dead, prey using enzymes to digest their food ingesting it preying on animals

The larvae of some insects are merely small versions of the adult, whereas the larvae of other insects look completely different from adults, eat different foods, and may live in different habitats. Which of the following is most directly involved in the evolution of these variations in metamorphosis? the evolution of meiosis artificial selection of sexually immature forms of insects the origin of a brain changes in the homeobox genes governing early development

What do animals ranging from corals to monkeys have in common? presence of Hox genes type of body symmetry a mouth and an anus number of embryonic tissue layers

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).

Which of the following is radially symmetrical? a dog a spoon a submarine sandwich an automobile a doughnut

Gastrulation is the process that directly forms the _____. organs blastula muscles central nervous system primary germ layers

Which of the following animals does NOT have a body cavity? mouse flatworm nematode clam earthworm

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 _____. develops an archenteron develops a blastopore develops germ layers exhibits spiral cleavage or radial cleavage

What do all deuterostomes have in common? Adults are bilaterally symmetrical. All have a spinal column. Embryos have pharyngeal pouches that may or may not form gill slits. The pore (blastopore) formed during gastrulation becomes the anus.

An organism that exhibits cephalization probably also _____. is diploblastic is bilaterally symmetrical has a coelom is segmented

Which of the following statements is correct? All animals share a common ancestor. Most animal phyla belong to the clade Radiata. Sponges are diploblastic animals. The origin of all extant animal phyla can be traced to the Cambrian explosion. Eumetazoans have three embryonic tissue layers.

Why might researchers choose to use molecular data (such as ribosomal RNA sequences) rather than morphological data to study the evolutionary history of animals? Some phyla vary too widely in morphological characteristics to be classified accurately. Morphological changes usually do not result from molecular changes. Sequence data can be gathered faster than morphological data, and morphological data provides a different perspective.