2012年高考生物试卷（海南）（空白卷）
2012年普通高等学校招生全国统一考试（海南卷）生物第I卷选择题：本大题共25小题，每小题2分。在每个小题给出的四个选项中，只有一项是符合题目要求的。2.关于蛋白质的叙述，错误的是A.有些蛋白质是染色体的组成成分B.酶在催化反应前后，其分子结构不变C.食盐作用下析出的蛋白质发生了变性D.蛋白质可与双缩脲试剂产生紫色反应4.下列操作中，不可能导致淀粉酶活性发生变化的是A.淀粉酶溶液中加入强酸 B.淀粉酶溶液中加入蛋白酶C.淀粉酶溶液中加入淀粉溶液D.淀粉酶经高温烘干制成粉剂[来源:Z.xx.k.Com][来源:Z_xx_k.Com]6.关于微生物的叙述，错误的是第1页|共9页A.硝化细菌虽然不...
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