Human development begins when cells are exposed to: Question 12 options: NODAL embryokines
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Question 12 options:
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NODAL
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embryokines
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- Embryo biopsy is an important procedure to prescreen the embryo for congenital abnormalities without endangering the growth and development. Group of answer choices -True -FalseQUESTION 4 What is the purpose of cleavage during embryonic development? To allow the embryo to get larger To allow the embryo to begin to form organs To generate multiple layers of cells in the embryo To produce many cells quickly so that more protein production can occurQUESTION 3 Which of the following is the correct comparision of fertilization in sea urchins and mammals? Both sea urchin and mammalian embryos use membrane depolarization as a fast block to polyspermy O Cleavage occurs before fertilization in sea urchins, but after fertilization in mammals Sea urchin embryos first undergo cell division about 24 hours after fertilization while mammalian embryos undergo cell division 90 minutes after fertilization Sea urchin embryos have a jelly coat while mammalian embryos have a zona pellucida
- Is it moral to do stem cell research on embryos? Cite moral and ethical reasons, can you give an alternative?Amniocentesis is a prenatal medical procedure conducted by extracting and analyzing fetal cells in the amniotic fluid, the fluid that surrounds the fetus. What information can be obtained about the developing fetus through amniocentesis? fetal infections environmental toxin-induced defects structural defects chromosomal abnormalities IncorrectThere are 6 major events in fertilization. Discuss the process of fertilization or conception, with emphasis on the sperm-egg interaction. Egg-binding proteins on the sperm cell surface bind to molecules on the egg cell membrane. What happens to the chromosomes of the sperm and egg? The sperm cell membrane fuses with the egg plasma membrane, allowing the sperm nucleus and centriole to enter the egg cytoplasm. What is the purpose/role of the centriole during fertilization? The final event would be when the egg and sperm pronuclei migrate toward each other in preparation for syngamy. What is the purpose of reproduction?
- Suppose that in the near future, you are a prenatal care provider. In the most recent ultrasound checkup on the expecting mother, you unfortunately found that the fetus is suffering a neural tube defect in the form of anencephaly. Seeing as the mother is still in the 12th week of pregnancy or the 1st trimester, the pregnancy can still be terminated via medical means. How would you explain to the parents the situation they are in?There are 6 major events in fertilization. Discuss the process of fertilization or conception, with emphasis on the sperm-egg interaction. Proteins on the sperm plasma membrane bind to ZP3 molecules within the zona pellucida of the egg. Why is this event important? Zona binding triggers the acrosome reaction, in which the sperm plasma membrane fuses with the outer acrosomal membrane, causing exocytosis of acrosomal contents. What is in the "acrosomal content"? Acrosomal enzymes begin to dissolve a hole in the zona pellucida. This enzymatic degradation, accompanied by rapid sperm tail beating, moves the sperm through the zona. Where does the sperm intend to reach?Order the events leading to the sperm's nucleus fusing with the egg's nucleus. Question 1 options: sperm's nucleus is released into the egg's cytoplasm sperm burrows through the orona radiata sperm's nucleus and egg's nucleus fuse sperm's cell memrbane fuses with egg's cell membrane sperm's acrosome enzymes burrows through the zona pellucida the zona pellucida changes so that any new sperm's acrosome cannot burrow through the zona pellucida
- Which of the following is NOT a function of the placenta? Question 23 options: To supply the embryo or fetus with milk. To transfer gases to an embryo or fetus. To transfer nutrients to an embryo or fetus. To remove waste from the embryo or fetus.What ethical issues are associated with the storage of embryos? Who should be making the decision about the status of stored embryos?After fertilization a developing embryos goes through several changes. At about 2-3 days, what is the embryo referred to as?
