Exam 32: An Introduction to Animals

Suppose a researcher for a pest-control company developed a chemical that inhibited the development of an embryonic mosquito's endodermal cells.Which of the following would be a likely mechanism by which this pesticide works?

Bilateral symmetry is advantageous primarily because it allows for the development of

A typical ectoparasite has all of the following characteristics EXCEPT that it

Which of the following is not a feature of the tube-within-a-tube body plan in most animals?

Although our current understanding of why coral bleaching occurs is incomplete,which of the following is consistent with the most commonly held hypothesis of this phenomenon as discussed in your text?

Which reproductive strategy is facilitated by (i.e.is easier to use in)an aquatic habitat,as compared with a terrestrial habitat?

On the tree of life,animals are the smallest and least diverse of the major groups.

The evolution of animal species has been prolific (the estimates go into the millions and tens of millions).To what does the text attribute much of this diversity?

If you think of the tube-within-a-tube body plan as a pipe with a straw inside,where would you expect to find most of the ectodermal,mesodermal,and endodermal germ layers,respectively?

In a habitat with only one abundant food source,which type of metamorphosis would you expect an animal species to undergo?

Figure 32.1 -As you are on the way to Tahiti for a vacation,your plane crash-lands on a previously undiscovered island.You soon find that the island is teeming with unfamiliar organisms and,as a student of biology,you decide to survey them (with the aid of the Insta-Lab Portable Laboratory you brought along in your suitcase).You select three organisms and observe them in detail,making the notations found in Figure 32.1. Which organism would you classify as an animal?

If humans were characterized as undergoing metamorphosis,infant humans would be described as

If humans were characterized as undergoing metamorphosis,human development from infant to adult would be better described as

Most cnidarians are known to produce toxins.In fact,it has been claimed that one particular species produces the most deadly of all toxins on the planet.What feature of this group most likely evolved simultaneously with the development of these toxins?

Which of the following characteristics is least associated with a sessile lifestyle?

Which of the following species would you not classify as an animal?

Lophotrochozoans differ from ecdysozoans in that

What do all sponges have in common?

Which feeding tactic is most associated with a large-toothed,predatory carnivore?

Why might researchers choose to use molecular data (such as ribosomal RNA sequences)rather than morphological data to study the evolutionary history of animals?