QUESTIONS (TRUE/FALSE):
1. The gene for a hatching enzyme is the same gene used to make blood.
2. A blastula is a hollow ball of cells
3. Envelysin dissolves egg membranes
4. The neural plate forms after the nervous system
5. a noggin is a hard head
6. XLIMK1 is computer jargon
7. The BSP gene initiates chicken bone matrix development
8. A movie theater is also called a chimera
9. Wilm's tumor suppressor gene directs kidney development
10. A neural plate divides the blastula in half

MULTIPLE CHOICE
11. Which does not occur during embryonic development?
a. Head and tail orientation
b. hatching
c. hybridization
d. neural plate development
e. differentiation
12. Using our examples, which is the last to develop in the embryo?
a. blood
b. kidneys
c. bone
d. nervous system
e. neural plate
13. The following are distinct stages of embryonic development except
a. fertilization
b. differentiation
c. cell division
d. blastula formation
e. colonization
14. The hatching enzyme is also called
a. noggin
b. Wilm's suppressor gene
c. envelysin
d. the BSP enzyme
e. XLIMK1
15. Every active gene within the genome produces its effects to make a developing embryo
a. by waiting for the other genes to start
b. a better creature
c. grow faster than its parents
d. by acting in a programmed sequence
e. seem to go trough stages

ESSAY:
16. Describe a sequence of gene expression (using the examples in this article) that is different from the sequence above and might produce a viable embryo.
17. Why is collagen (a connective protein) so important for cellular and organism development?
18. What would happen to a developing embryo if the proper genes for head and tail orientation were not expressed?
19. Noggin is a protein that contributes to the initial cell differentiation. What do we mean by cell differentiation?
20. What is the effect of cellular differentiation? (Cite at least two examples?)