請教兩題生物 - 考試

第一題

Which one of the following is not needed for active transport?
(ans:a)

a. a concentration gradient
b. a membrane
c. three ions
d. an outside energy source
e. all of the above are needed

問題a:
主動運輸根據沈浩老師的講義是"逆濃度梯度"
所以我覺得a.應該是需要的，就是有"逆"的concentration gradient

問題c:
three ions 是甚麼啊?是Na-K pump的 3 Na+ 嗎??

問題d.
ATP->ADP不是應該在細胞內嗎?怎麼是outside呢??



第二題

Which of the following statements about cotransport of solutes across a
membrane is correct?

a. Cotransport involves the hydrolysis of ATP by the transporting protein.
b. A cotransport protein is most commonly an ion channel.
c. Cotransport proteins allow a single ATP-powered pump to drive the active
transport of many different solutes.
d. The sodium-potassium pump is an example of a cotransport protein.
e. In cotransport, both solutes that are being transported are moving down
their chemical gradients.

問題b:
是要改成"carrier protein"嗎?

問題d:
沈浩老師講義p.237 提到Na-K pump是cotransport，還是我誤解了呢?


感謝各位指教，謝謝大家。

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