HW6ab - HW#6AWhenDoesHumanLifeBegin?

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HW#6A When Does Human Life Begin? HW#6A WHEN DOES HUMAN LIFE BEGIN? (02/07/12 for 02/10/12)   National Catholic Bioethics Quarterly, Vol. 9, No. 1 (Spring 2009), pp. 131-149 Q1: The two criteria used to distinguish one cell type from another are unique __cell composition__ and  __behavior__. Q2: Following the binding of sperm and egg, the __membranes__ of these cells fuse creating a single hybrid cell: the  __zygote__. This fusion occurs within one __second__. molecular __composition__ and is distinct from either __gamete__. Q4: Within minutes of membrane fusion and over the course of the next __30__ minutes, the zygote initiates  __chemical__ changes that modify the zona pellucida, which is an a-cellular structure surrounding the zygote. These  changes __prevent__ additional sperm from binding to the cell surface and __blocks__ additional sperm intrusion.   Q5: Although the goals of both sperm and egg have been to find each other, the zygote acts to __prevent__ binding  by additional sperm to the egg. The behavioral patterns or trajectories of the gametes __cease__ and the trajectory of  the zygote __emerges__. Q6: Within 8-to-10 hours of the sperm-egg fusion, the two nuclei __replicate__ their DNA in anticipation of the first 
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HW6ab - HW#6AWhenDoesHumanLifeBegin?

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