1.Which of the following is common to both extracellar and intracellular digestion? A> the ability to phagocyte food particles. B> the speed of digestion C> the presence of a digestive cavity D> the ability to consume both large and small food items E> none of all 这题答案为A 想请问一下,对摄食而言在胞内消化有吞食作用我可以理解,但胞外消化会有 吞食作用吗? 食物在消化道消化为小分子後不就送如血管,之後由血液运输到各细胞,在经主被动运 输入细胞内做代谢以供能吗?(Marcophage虽有吞食作用但与胞内外消化是两码子,暂不 论之) 2.Which of the following is not an advantage of extracellular digestion? A> The interior of cells is protected from hydrolytic enzymes. B> Very large portion of food can be consumed at once and digested over a long period of hours to weeks. C> Specialized regions of the cavity can segregate the digested food from nondigested food. D> Digestion can be regulated by hormones. E> Vacuoles allow for direct phagocytosis by individual cells. 这题答案为E;但我想不出解释的理由~ 希望和大家讨论看看喔~ 谢谢大家~ --

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