animal diversity from old midterms

animal diversity from old midterms - Biology 5B sample...

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sample questions for 1 st Midterm Exam, page 1 Sample questions, 1 st miderm; animal biology Read each question carefully before selecting the single best answer. (for questions 1 and 2): Two biologists, Jane and Joe, examine the characteristics of 5 animal species (A, B, C, D, E), and each creates a phylogenetic tree based on their understanding of the most likely relationships between these animals: A B C D E A E Joe’s tree Jane’s tree B C D 1. Assuming these are imaginary animals which of the following statements about the phylogenetic relationships described by the two trees is correct? a. Both trees show similar degrees of relationship between B and C. b. Both trees indicate that A is ancestral to B. c. Both trees show the same relationship between D and E. d. If E and D both have wings, then we can assume from both trees that C does also. e. none of the above are correct. 2. In animal development: a. Formation of germ layers results from differences in the genetic information in ectoderm, endoderm, and mesoderm cells. b. Cellular differentiation occurs because cells gain additional nuclei (a syncitium). c. Mesoderm can form from either ectoderm or endoderm. d. Cell fates are fixed prior to gastrulation. e. both (a) and (c) are correct. 3. Developmental biologists are often concerned with the fates of embryonic cells – i.e., what part of an adult animal does a particular embryonic cell develop into? Which of the following is a plausible ‘fate map’ for animal cells during development? [the symbol means ‘can develop into’]: a. mesoderm cell in an early pseudocoelomate embryo cell in the gut. b. cell from the internal part of a gastrula-stage embryo skin cells and neurons. c. muscle stem cell any mesodermal cell type. d. cells from a blastula-stage embryo muscle cell, intestine cell, or brain cell. e. a cell formed by schizocoely neuron or other brain cell. 4. Which of the following is not a reason why malaria and African sleeping sickness (trypanosomiasis) pose such challenging health problems: a. protistans are eukaryotic like ourselves, so it’s difficult to find drugs that attack the parasites without damaging our own cells. b. drug therapy is a strong selective force that leads to drug-resistant parasites. and Trypanosoma are both apicomplexans that ‘hide’ within cells. e. both parasites have evolved ways to defeat the vertebrate immune system. 5. Which of the following is at the eucoelomate grade of organization? a. Platyhelminthes b. Echinodermata c. Nematoda d. Cnidaria e. none of the above (a) - (d) are eucoelomate
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animal diversity from old midterms - Biology 5B sample...

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