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Unformatted text preview: When making both sides of the conversation, Sometimes I dont know what to do.Sam Phillips 1. About how many days does it take to go from newly fertilized egg, to a blastocyst ready to be implanted in the wall of a uterus? A. 1 B. 3 C. 5-8 D. 14-21 2. There are a couple of ways that fertilization by more than one sperm is avoided. In the slower block of polyspermy: A. a wave of calcium spreads throughout the cell to cause release of cortical vesicle contents B. a voltage change occurs in milliseconds that changes the shape of receptors in the egg cell membrane C. enzymes released from cortical vesicles cause receptors in egg cell membrane to be degraded D. A and C above. E. A, B and C above. 3. At what stage(s) can one or more cells of a new embryo/zygote become separated, and subsequently form two separate but genetically identical embryos ( clones)? A. one cell stage B. 2 cell , 4 cell stage, or 8 cell stage C. blastocyst stage D. any time after the inner cell mass has formed 4. Where do embryonic stem cells come from? A. 4-cell stage embryos, by removing one of the cells B. mammary gland cells C. the outer ring of cells in a morula D. the inner clump of cells in a blastocyst 5. Dolly was cloned by: A. SCNT, ie, putting the nucleus of a mammary gland cells into an egg that had no nucleus B. tricking a mammary gland cell into growing by shocking it electrically C. standard In Vitro Fertilization techniques (sperm meets egg) in a veterinarian lab D. removing a blastocyst from a pregnant ewe and implanting it in another sheep 6. Theoretically, at the blastocyst stage, A. cells of the outer sphere can be grown in culture and used for therapeutic purposes B. cells of the inner mass can be grown in culture and used for therapeutic purposes C. cells of the inner mass can be harvested, and grown into any number of complete adult organisms D. A and C above E. A, B and C above. T/F 7. In the 8-cell stage, each cell is totipotent. ( A = true B=false) T/F 8. It isnt until the blastocyst stage that some of the cells become destined to form placenta, amniotic sac, yolk sac, and chorion. 9. Recently, a new method of obtaining stem cells was announced. Which process below did it involve?...
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This note was uploaded on 04/29/2008 for the course BIOS 100 taught by Professor Kelso during the Spring '07 term at Ill. Chicago.
- Spring '07