正确答案: B

粘度减小

题目：下列对蛋白质变性后主要表现的叙述中错误的是

解析：

21．答案：B

[考点] 蛋白质的理化性质

[分析] 蛋白质在某些理化因素作用下，空间结构被破坏，结构松散，分子不对称性变大，所以粘度应增大，而不是减小，故B是错误的。其他选项均正确。

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举一反三的答案和解析：

[单选题]根据下列文章，回答26～30题。It used to be so straightforward. A team of researchers working together in the laboratory would submit the results of their research to a journal. A journal editor would then remove the authors names and affiliations from the paper and send it to their peers for review. Depending on the comments received, the editor would accept the paper for publication or decline it. Copyright rested with the journal publisher, and researchers seeking knowledge of the results would have to subscribe to the journal.No longer. The Internet and pressure from funding agencies, who are questioning why commercial publishers are making money from government-funded research by restricting access to it- is making access to scientific results a reality. The Organization for Economic Co-operation and Development （OECD） has just issued a report describing the far-reaching consequences of this. The report, by John Houghton of Victoria University in Australia and Graham Vickery of the OECD, makes heavy reading for publishers who have, so far, made handsome profits. But it goes further than that. It signals a change in what has, until now, been a key element of scientific endeavor.

the publication routine of laboratory reports.

解析：本题考查的是考生对第一段的理解。根据文章，第一段作者说到，实验室把他们的研究结果递交刊物，刊物的编辑在隐去作者姓名及相关信息后把论文递交给编审，根据审查结果或出版或拒绝出版此篇论文。版权由杂志社保留。研究者必须订阅杂志才能查找此研究结果的相关文章。很明显，此段讲述的是实验室报告的出版程序。选项A刊物编辑的背景信息和选项C作者与出版商的关系及选项D刊物出版的传统流程都未能准确概括本段的含义。

[单选题]利率与投资总量呈反方向变化的原因是( )。

投资与储蓄之间的替代效应

解析：[分析]

[单选题]肛门周围深部脓肿常发生

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