1. Chapter 47 Quiz
Animal Development

2. Question #1
As an animal develops, organs form and the body transforms into a shape typical of the species, in a process called _____. A. cleavage B. cell differentiation C. gastrulation D. morphogenesis

3. Question #2
A sea urchin sperm penetrates the jelly coat of an egg and adheres to receptor proteins on the egg's surface as a result of _____. A. The cortical reaction B. depolarization C. The acrosomal reaction D. gastrulation

4. Question #3
How does a zygote differ from an ovum? A. A zygote has more chromosomes. B. A zygote divides by meiosis. C. A zygote is smaller. D. A zygote is larger.

5. Question #4
After a sperm penetrates an egg, a fertilization envelope forms. This envelope _____. A. secretes important hormones B. enables the fertilized egg to implant itself in the wall of the uterus C. attracts additional sperm to the egg D. prevents more than one sperm from entering the egg

6. Question #5
Cell divisions called _____ proceed so rapidly in the developing embryo that there is no growth of the cells between divisions. A. meiosis B. cleavage C. binary fission D. fragmentation

7. Question #6
During cleavage the single large zygote is converted into a _____. A. multicellular embryo consisting of smaller cells called blastomeres B. three-layered embryo called a gastrula C. multicellular embryo consisting of a zona pellucida and a zygote D. fetus

8. Question #7
The cortical reaction induces a rise in this cation that stimulates cortical granules to release their contents outside the egg A. Mg2+ B. Zn2+ C. Fe3+ D. Ca2+

9. Question #8
During gastrulation, the primitive _____ forms. A. eye B. gut C. nervous system D. heart

10. Question #9
Which of the following events is not part of gastrulation? A. sorting of cells into three layers B. obliteration of the blastocoel C. differentiation of cells into tissues D. migration of epiblast cells

11. Question #10
Which one of the following describes the correct sequence of stages during embryogenesis? A. cleavage, blastula, gastrula B. cleavage, gastrula, blastula C. blastula, cleavage, gastrula D. gastrula, cleavage, blastula

12. Question #11
What are the three embryonic germ layers produced by gastrulation and where are they located (innermost, middle or outermost).