Which of the following characteristics generally

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47) Which of the following characteristics generally applies to protostome development? A) radial cleavage B) determinate cleavage C) diploblastic embryo D) blastopore becomes the anus E) archenteron absent Answer: B Topic: Concept 32.3 Skill: Knowledge/Comprehension 48) Protostome characteristics generally include which of the following? The following questions are based on the description below. 13
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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). 49) This embryo may potentially develop into a(n) 50) If we were to separate these eight cells and attempt to culture them individually, then what is most likely to happen? 51) If an undisturbed embryo is allowed to develop further, then one should expect that A) the first opening of the gastrula will ultimately serve as the mouth. B) upon metamorphosis, the resulting trochophore larva will gain a backbone. C) upon gastrulation, a solid ball of cells will be produced. D) both A and B E) both B and C Answer: A Topic: Concept 32.3 Skill: Knowledge/Comprehension 52) The most ancient branch point in animal phylogeny is that between having 14
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53) With the current molecular-based phylogeny in mind, rank the following from most inclusive to least inclusive. 1. ecdysozoan 2. protostome 3. eumetazoan 4. triploblastic
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