1.In which animal does blood flow from the respiratory organ to the heart before circulating through the rest of the body? (A)annelid (B)mollusk (C)fish (D)frog (E)insect 此題答案是C....不過魚的心臟不是缺氧寫嗎?...我覺得答案是D 2.Which of the following is part of the central nervous system? (A)sympathetic (B)spinal nerve (C)spinal cord (D)ganglion 此題答案是C.....我知道CNS是腦和脊髓，但B不算嗎? 3.Which of the following state about hormones is incorrect? (A) Glands that produce them are ductless glands. (B) They are produced only by organs called endorcrine organs. (C) Some are water soluble and some are not. (D) They often maintain steady-state condition 此題答案是B....不懂B哪裡錯(雖然講only讓我覺得太絕對應該是錯的ˊˋ) 4.Hormone X produces its effect in its target cells via the cAMP second messenger system. Which of the following will produce the greatest effect in the cell? (A) a molecule of hormone X applied to the extracellular fluid surrounding the cell. (B) a molecule of hormone X injected into the cytoplasm of the cell. (C) a molecule of cAMP applied to the extracellular fluid surrounding the cell. (D) a molecule of cAMP injected into the cytoplasm of the cell. (E) a molecule of activated, cAMP- dependent protein kinase injected into the cytoplasm of the cell. 這題答案是A...我覺得既然二級傳訊者是cAMP那直接把cAMP注到細胞中的D選項不是 更好嗎? E選項用活化的PKA不是也會造成更大的效果嗎? 以上是我的疑問，拜託會的人解答一下。 謝謝。 -- ╭──────╮ ╭──────╮ │哈哈哈..... │ ╲囧╱ ┤笑點！ │ ╰┬─────╯ ｜ │ 快回來呀！ │ . ︵ ︵ ︵ （ˇ ╰──────╯ --

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