Lesson 25: Embryology Week 1 Quizellenj2024-10-03T13:57:30-04:00 Please sign up for the course before taking this quiz. 1. The protective layer around the first-week developing cells is called the:1 corona radiata chorion zona pellucida membrane 2. Which stage of development to scientist target for harvesting? (This would apply to experiments using mice, rats, and even sea urchins.)1 zygote blastula morula 3. The development that happens in the first week is essentially the same in any type of animal.1 True False 4. Blastula and blastocyst mean the same thing.1 True False 5. Where does the first week of development occur?1 in the fallopian tube in the uterus in the ovary 6. Totipotent means that the cell’s DNA is completely open, so that any part of it can be read and copied.1 True False 7. Which is totipotent?1 any cell in the morula a blastula cell the zygote any stem cell 8. What is an ectopic pregnancy?1 It's the same as a miscarriage, when the body expels the embryo. When the embryo is flushed out during menstruation. When the embryo develops outside the uterus. 9. Human and mammal eggs do not go through an hatching process, only bird and reptile eggs do this.1 True False 10. During the first week of development the number of cells increases but the overall size stays the same.1 True False 11. The cells in a newborn baby’s body are still pluripotent.1 True False 12. The “inner cell mass” will grow to become the embyro (baby) and the cells in the outer ring will become the placenta and the outer sac.1 True False 13. What do gap junctions do?1 Ensure that the cells will remain pluripotent. Allow a gap to open between cells so that oxygen can flow in. Allow cells to communicate by the exchange of cytosol. Provide an extremely flexible junction that will divide easily. 14. It takes an entire day for the zygote to go through its first mitosis.1 True False 15. “Morula” comes from the Greek word “morus” which means:1 marble berry small bumpy grape Lesson 26: Embryology Week 2 Back to: Lesson 25: Embryology Week 1