Biology 1402 Questions and Correct Answers

What is a feature of Animals, but is not seen outside of the animal kingdom? Ans: They have collagen in their extracellular matrix. Phylogenies based on morphology and phylogenies based on molecular data disagree on which one of the following issues? Ans: whether the appearance and type of coelom is important in interpreting phylogeny A horshoe-shaped crown of tentacles used by many invertebrates for feeding is called a Ans: lophophore Which of the following were a factor in a rapid diversification of Animal Phyla during the Cambrian Explosion? Ans: Rising levels of oxygen in the atmosphere. A scientist is studying the embryonic development of an unknown Animal. By understanding the development, the scientist can also understand where in the phylogeny this unknown Animal fits. This description is of the concept of Ans: Evo-Devo You are observing the embryonic development of a new species in your laboratory. This species has indeterminate development. You note a mutation in which one of the early cells mutates, loses its function, and disintegrates. An early cell is also called a blatomere. What do you hypothesize would happen to this being? Ans: Nothing--the remaining blastomeres would accommodate the formation of the necessary structures of the embryo. The some cells of the animals in Phylum Porifera have a flaggellum that moves water through the sponge and a collar that extracts food particles form the water. In what group have you encountered very similar cells before? Ans: the choanoflagellates Your lab group is assigned an unknown organism to identify to the level of Class. You have it narrowed down to Phylum Porifera. Which feature would allow you to identify the Class of your unknown creature? Ans: composition of spicules You are presented with an animal that resembles a jellyfish. As you examine it further, which characteristic would allow you to conclude that it belongs to the Phylum Ctenophora rather than the Phylum Cnidaria? Ans: presence of eight rows of comb-like tentacle