The major organizing center of the gastrulating embryo is the A. Inner cell mass B. Primitive streak C. Oropharyngeal membrane D. Primitive node E. Paraxial mesoderm The prechordal plate &/or the anterior visceral endoderm plays an important role in regionalization of the A. Notochord B. Embryonic mesoderm C. Forebrain D. Hindbrain E. Primitive node Which Pax is/are important for formation of midbrain? A. Paxl B. Pax3 C. Pax6 D. Pax2 + Pax5 E. Pax2 + Lim-1 or each question in this section, check all correct statements (½ point each line):

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Chapter1: The Human Body: An Orientation
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### Embryology Quiz

#### Multiple Choice Questions

5. The major organizing center of the gastrulating embryo is the __________.
   - A. Inner cell mass
   - B. Primitive streak
   - C. Oropharyngeal membrane
   - D. Primitive node
   - E. Paraxial mesoderm

6. The prechordal plate and/or the anterior visceral endoderm play an important role in regionalization of the __________.
   - A. Notochord
   - B. Embryonic mesoderm
   - C. Forebrain
   - D. Hindbrain
   - E. Primitive node

7. Which Pax is/are important for formation of the midbrain?
   - A. Pax1
   - B. Pax3
   - C. Pax6
   - D. Pax2 + Pax5
   - E. Pax2 + Lim-1

#### Check All That Apply

E. For each question in this section, check all correct statements (½ point each line):

1. In mouse embryos containing 8-16 cells, the cells with apical surfaces:
   - _____ will adopt a trophectoderm fate (trophoblast)
   - _____ will become cells of the inner cell mass
   - _____ are polar cells
   - _____ will express Cdx2
   - _____ will express Oct4
   - _____ will form the neural tube

2. Which of the following is/are mesenchymal:
   - _____ Epidermal cell
   - _____ Neural crest cell
   - _____ Neural tube cell
   - _____ Somite cell
Transcribed Image Text:### Embryology Quiz #### Multiple Choice Questions 5. The major organizing center of the gastrulating embryo is the __________. - A. Inner cell mass - B. Primitive streak - C. Oropharyngeal membrane - D. Primitive node - E. Paraxial mesoderm 6. The prechordal plate and/or the anterior visceral endoderm play an important role in regionalization of the __________. - A. Notochord - B. Embryonic mesoderm - C. Forebrain - D. Hindbrain - E. Primitive node 7. Which Pax is/are important for formation of the midbrain? - A. Pax1 - B. Pax3 - C. Pax6 - D. Pax2 + Pax5 - E. Pax2 + Lim-1 #### Check All That Apply E. For each question in this section, check all correct statements (½ point each line): 1. In mouse embryos containing 8-16 cells, the cells with apical surfaces: - _____ will adopt a trophectoderm fate (trophoblast) - _____ will become cells of the inner cell mass - _____ are polar cells - _____ will express Cdx2 - _____ will express Oct4 - _____ will form the neural tube 2. Which of the following is/are mesenchymal: - _____ Epidermal cell - _____ Neural crest cell - _____ Neural tube cell - _____ Somite cell
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