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