What do animals as diverse as corals and monkeys have in common?
A) body cavity between body wall and digestive system
B) number of embryonic tissue layers
C) type of body symmetry
D) presence of Hox genes
E) degree of cephalization
Answer: D
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Biology
- Which of the following is descriptive of protostomes?
- The blastopore denotes the presence of an endoderm-lined cavity in the developing embryo, a cavity that is known as the
- The blastopore is a structure that first becomes evident during
- You have before you a living organism, which you examine carefully. Which of the following should convince you that the organism is acoelomate?
- What distinguishes a coelomate animal from a pseudocoelomate animal is that coelomates
- At which developmental stage should one be able to first distinguish a protostome embryo from a deuterostome embryo?
- At which developmental stage should one be able to first distinguish a diploblastic embryo from a triploblastic embryo?
- A researcher is trying to construct a molecular-based phylogeny of the entire animal kingdom. Assuming that none of the following genes is absolutely conserved, which of the following would be the best choice on which to base the phylogeny?
- 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
- An adult animal that possesses bilateral symmetry is most certainly also
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- What is the probable sequence in which the following clades of animals originated, from earliest to most recent? 1. tetrapods 2. vertebrates 3. deuterostomes 4. amniotes 5. bilaterians
- Fossil evidence indicates that the following events occurred in what sequence, from earliest to most recent? 1. Protostomes invade terrestrial environments. 2. Cambrian explosion occurs. 3. Deuterostomes invade terrestrial environments. 4. Vertebrates become top predators in the seas.
- Whatever its ultimate cause(s), the Cambrian explosion is a prime example of
- Which of the following genetic processes may be most helpful in accounting for the Cambrian explosion?
- Which statement is most consistent with the hypothesis that the Cambrian explosion was caused by the rise of predator-prey relationships?
- Evidence of which structure or characteristic would be most surprising to find among fossils of the Ediacaran fauna?
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