题目

多个氨基酸分子缩合形成具有两条肽链的蛋白质时,相对分子量减少了900,由此可推知该蛋白质分子中所含的氨基酸数和肽键数最可能分别是(     ) A.52,50           B.50,48           C.50,50           D.51,49 答案:A The Summer Palace is really beautiful.In fact, I doubt whether China has ________ park. [  ] A.a more beautiful B.a most beautiful. C.the most beautiful D.a beautiful
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