作者neveror (海带)
看板TransBioChem
标题[生物] 几题动物生理的问题
时间Fri Jun 12 14:44:48 2009
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
此题答案是C....不过鱼的心脏不是缺氧写吗?...我觉得答案是D
2.Which of the following is part of the central nervous system?
(A)sympathetic (B)spinal nerve (C)spinal cord (D)ganglion
此题答案是C.....我知道CNS是脑和脊髓，但B不算吗?
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
此题答案是B....不懂B哪里错(虽然讲only让我觉得太绝对应该是错的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.
这题答案是A...我觉得既然二级传讯者是cAMP那直接把cAMP注到细胞中的D选项不是
更好吗? E选项用活化的PKA不是也会造成更大的效果吗?
以上是我的疑问，拜托会的人解答一下。
谢谢。
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※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 220.140.9.1
1F：推 il441315:2. 脑和脊髓是CNS,但脑神经跟脊神经不是CNS而是PNS 06/12 21:42
2F：→ neveror:喔喔喔!对吼脑神经是源自脑而已 不是在脑里面的神经= =" 06/13 00:43
3F：→ neveror:谢谢一楼 06/13 00:44
4F：推 il441315:嗯嗯 不会 至於第4题我自己的看法是因为X分子要结合到 06/13 21:45
5F：→ il441315:细胞膜上的结合受体 再经过一些过程产生第二传讯分子 06/13 21:46
6F：→ il441315:所以其他选项都不太好，这是我的想法啦，可以讨论看看。 06/13 21:47