Exam 32: An Introduction to Animal Diversity

The following questions are based on the description below. A student encounters an animal embryo at the eight-cell stage. The four smaller cells that comprise one hemisphere of the embryo seem to be rotated 45 degrees and lie in the grooves between larger, underlying cells (spiral cleavage). -What is characteristic of all ecdysozoans?

The following questions are based on the description below. A student encounters an animal embryo at the eight-cell stage. The four smaller cells that comprise one hemisphere of the embryo seem to be rotated 45 degrees and lie in the grooves between larger, underlying cells (spiral cleavage). -According to the evidence collected so far, the animal kingdom is

Which of these is a point of conflict between the phylogenetic analyses presented in Figures 32.10 and 32.11 of your textbook?

The following questions are based on the description below. A student encounters an animal embryo at the eight-cell stage. The four smaller cells that comprise one hemisphere of the embryo seem to be rotated 45 degrees and lie in the grooves between larger, underlying cells (spiral cleavage). -What kind of data should probably have the greatest impact on animal taxonomy in the coming decades?

The following questions are based on the description below. A student encounters an animal embryo at the eight-cell stage. The four smaller cells that comprise one hemisphere of the embryo seem to be rotated 45 degrees and lie in the grooves between larger, underlying cells (spiral cleavage). -Which of the following organisms are deuterostomes?

Cephalization is most closely associated with which of the following?

Soon after the coelom begins to form, a researcher injects a dye into the coelom of a deuterostome embryo. Initially, the dye should be able to flow directly into the

Protostome characteristics generally include which of the following?

What distinguishes a coelomate animal from a pseudocoelomate animal is that coelomates

Evidence of which structure or characteristic would be most surprising to find among fossils of the Ediacaran fauna?

The following eight questions refer to Figure 32.2A (morphological) and Figure 32.2B (molecular) phylogenetic trees of the animal kingdom. Figure 32.2A: Morphological Phylogeny Figure 32.2B: Molecular Phylogeny -If the traditional phylogeny (Fig. 32.2A)eventually becomes obsolete, the formerly close relationship depicted between the annelids and arthropods will probably be viewed, in retrospect, as an instance of

The following questions are based on the description below. A student encounters an animal embryo at the eight-cell stage. The four smaller cells that comprise one hemisphere of the embryo seem to be rotated 45 degrees and lie in the grooves between larger, underlying cells (spiral cleavage). -If we were to separate these eight cells and attempt to culture them individually, then what is most likely to happen?

Which of these, if True, would support the claim that the ancestral cnidarians had bilateral symmetry? 1) Cnidarian larvae possess anterior-posterior, left-right, and dorsal-ventral aspects. 2) Cnidarians have fewer Hox genes than bilaterians. 3) All extant cnidarians, including Nematostella, are diploblastic. 4) Beta-catenin turns out to be essential for gastrulation in all animals in which it occurs. 5) All cnidarians are acoelomate.

The blastopore denotes the presence of an endoderm-lined cavity in the developing embryo, a cavity that is known as the

Figure 32.1 shows a chart of the animal kingdom set up as a modified phylogenetic tree. Use the diagram to answer the following questions. -Which group includes both ecdysozoans and lophotrochozoans?

Cephalization is primarily associated with

Organisms showing radial symmetry would likely

Which of the following is (are)unique to animals?

You have before you a living organism, which you examine carefully. Which of the following should convince you that the organism is acoelomate?

The following eight questions refer to Figure 32.2A (morphological) and Figure 32.2B (molecular) phylogenetic trees of the animal kingdom. Figure 32.2A: Morphological Phylogeny Figure 32.2B: Molecular Phylogeny -In the traditional phylogeny (Fig. 32.2A), the sponges are considered to be a clade, whereas in the molecular phylogeny (Fig. 32.2B), sponges