BISC 120 Exam 3 Review

BISC 120 Exam 3 Review - BISC 120 SI Dr Donal Manahan Exam...

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BISC 120 SI Pavika and Sean Dr. Donal Manahan [email protected] Exam 3 Review usc.edu/si 1 1. All animals possess these 5 traits: 1. 2. 3. 4. 5. 2. Describe 3 hypotheses for the causes of the Cambrian explosion. 1. 2. 3. 3. In lab, you are investigating an unknown organism. Which of the following should convince you that the organism is acoelomate? A. It responds to food by moving toward it. B. It is triploblastic. C. It has bilateral symmetry. D. It possesses sensory structures at its anterior end. E. Muscular activity of its digestive system distorts the body wall. 4. Indicate whether the characteristic is for a protostome (P) or deuterostome (D). 1. ___ Blastopore becomes the mouth 2. ___ Indeterminate at the eight-cell stage 3. ___ Solid masses of mesoderm split and form coelom 4. ___ Spiral cleavage 5. ___ Includes Echinoderms 6. ___ Embryonic stem cells can be extracted through blastula stage 5. Which of these statements is NOT supported by the molecular model of animal phylogeny? A. All animals share a common ancestor. B. Chordates and Echinoderms are both deuterostomes. C. Eumetazoans are an animal clade with true tissues. D. There are 2 bilaterian clades: protostomes and deuterostomes. E. Sponges are basal animals. 6. Draw an object with radial symmetry and one with bilateral symmetry. Draw a line of symmetry through each, and label the parts if necessary.
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BISC 120 SI Pavika and Sean Dr. Donal Manahan [email protected] Exam 3 Review usc.edu/si 2 7. Fill in the approximate time these major events occurred. _______ Animal common ancestor lived _______ Cambrian explosion _______ Animals transition to land _______ Vertebrates transition to land _______ Dinosaurs dominate Earth; first mammals emerged (what era?) _______ Cretaceous mass extinction _______ Mammals and insects diversified (what era?) 8. Draw and label the first 5 major stages of animal embryonic development. 9. Which of the following characteristics are not shared by Arthropods from Annelids? 1. Segmented bodies 2. Jointed appendages 3. Hard exoskeleton 4. Triploblastic 5. Closed circulatory system A. 1 only B. 2 and 3 C. 2, 3, and 5 D. 1, 2, 3, 4, and 5 E. 1, 2, and 4 10. Fill in the blanks with the appropriate number.
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