CMMB 403 midterm 2 Questions with complete solution

CMMB 403 midterm 2 Questions with complete solutionCMMB 403 midterm 2 Capacitation - correct answer changes to the sperm after it enters the female to be able to fertilize the egg. takes 6 hours to become competent. Sperm become hyperactivated to be able to penetrate the cumulus and the zona p. what is the acrosome - correct answer tip of sperm. releases enzymes to degrade the zona pellucida to allow the sperm DNA to enter. exocytosis of the enzymes to allow contact with the egg How does the sperm bind to the zona pellucida - correct answer specific ZP proteins on the zona pellucida (ZP2). There are 4 total proteins that are expresse dby the zona, but ZP2 binds the sperm how is the sperm DNA released into the egg - correct answer membrane fusion. The contact between the sperm and egg is not at a 90∙ angle, more shallow. Isumo proteins on the inner layer of the acrosome bind to juno receptors on the egg after the acrosome reaction to allow this membrane fusion. how is polyspermy blocked - correct answer protease enzymes released by the corticol reaction cleave ZP2 on the zona pellucida to prevent further sperm from binding and entering. NO ELECTRICAL CHANGE what stage do oocytes stay at in humans. what does this mean for the nucleus and the DNA - correct answer metaphase II. This means that there is no true nucleus in the egg until the 2 cell stage of the embryo. the second set of DNA in the phase is kept as a separate polar body outside of the egg oocyte