問題詳情
48. From earliest to latest, the overall sequence of early development proceeds in whichof the following sequences?
(A) first cell division → synthesis of embryo's DNA begins → acrosomal reaction → cortical reaction
(B) cortical reaction → synthesis of embryo's DNA begins → acrosomal reaction → first cell division
(C) cortical reaction → acrosomal reaction → first cell division →synthesis ofembryo's DNA begins
(D) acrosomal reaction → cortical reaction →synthesis of embryo's DNA begins → first cell division
參考答案
答案：[無官方正解]
難度：計算中-1
書單：沒有書單，新增
用户評論
【草薙素子】評論
● acrosome（頂體）：精子頭部的頂狀膜包結構，含頂體酶等可分解卵子外圍的膜（透明帶）。● cortical reaction（皮質反應）：精子接觸後，卵表面發生一系列變化以阻止其他精子進入。故順序為：精子接觸卵子（acrosomal reaction）→卵阻止其他精子進入（cortical reaction）→胚胎DNA合成（synthesis of embryo's DNA）→細胞分裂答案(D)