[問題] 討論兩題Brooker的題目~
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
這題答案為A
想請問一下,對攝食而言在胞內消化有吞食作用我可以理解,但胞外消化會有
吞食作用嗎?
食物在消化道消化為小分子後不就送如血管,之後由血液運輸到各細胞,在經主被動運
輸入細胞內做代謝以供能嗎?(Marcophage雖有吞食作用但與胞內外消化是兩碼子,暫不
論之)
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.
這題答案為E;但我想不出解釋的理由~
希望和大家討論看看喔~ 謝謝大家~
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