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