Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 43.1, Problem 1R
Summary Introduction
To review:
The sperm’s contribution in cell signaling apart from contributing a nucleus.
Introduction:
Most of the requirements for the survival of an embryo are fulfilled by the egg. The sperm contributes the nucleus and the centrioles, which is followed by cell signaling. The cell signaling produced by the centrioles is required for the axes determination of the embryo.
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Life: The Science of Biology
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- A classical experiment studying the fate determination of stem cells in the developing embryo uses the transplantation of somites from one organism to another. In such an experiment, a scientist transplanted somites 20, 21, and 22 from the right side of the neural tube from five-day-old developing quail embryos into chick embryos. The transplantation was performed in two orientations so that the order of the somites was sometimes reversed. Use the passage to answer the question. Suppose that somite stem cells commit to their cell fates by three days post fertilization. Which result would be MOST likely in the chick embryos receiving somites transplanted in the reverse order? A. The organs arising from quail somites develop in a normal order because local signaling molecules appropriately pattern the developing organs. B. The organs arising from quail somites develop in a normal order because transcriptional programs activated in the nucleus cannot be reversed.…arrow_forwardA classical experiment studying the fate determination of stem cells in the developing embryo uses the transplantation of somites from one organism to another. In such an experiment, a scientist transplanted somites 20, 21, and 22 from the right side of the neural tube from five-day-old developing quail embryos into chick embryos. The transplantation was performed in two orientations so that the order of the somites was sometimes reversed. Use the passage to answer the question. Observations of the developing chick embryo reveal that skeletal muscles develop from the transplanted somites even though motor neurons innervating those muscles arise from chick neural crest cells. Based on these observations, what is MOST likely true? A. Neural crest cells differentiate into somites. B. Neural crest cells fuse with developing somite cells. C. Neural crest cells develop from migrating somite cells. D. Neural crest cells send projections into developing…arrow_forwardA classical experiment studying the fate determination of stem cells in the developing embryo uses the transplantation of somites from one organism to another. In such an experiment, a scientist transplanted somites 20, 21, and 22 from the right side of the neural tube from five-day-old developing quail embryos into chick embryos. The transplantation was performed in two orientations so that the order of the somites was sometimes reversed. Use the passage to answer the question. As the somite cells develop into muscles, regular depolarizations in the muscles are required for the brain to properly form circuits with developing organs. Based on this observation, which prediction is MOST likely true? A. The muscles release neurotransmitters to stimulate the innervating neurons. B. The innervating neurons release neurotransmitters to stimulate the muscles. C. The muscles release hormones to stimulate the innervating neurons. D. The innervating neurons…arrow_forward
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- How is it that Wnt signaling is capable of mediating such diverse processes ascell division, cell fate, and cell guidance?arrow_forwardWhich components of the phosphoinositide signaling system are soluble and which are associated with the membrane?arrow_forwardWhat cell-surface event wouldlikely fail if a sperm contactedan egg of another species?arrow_forward
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