试题与答案

七年级1班生物兴趣小组的几位同学在做“馒头在口腔中的变化”的探究实验时,采用了不

题型:探究题

题目:

七年级1班生物兴趣小组的几位同学在做“馒头在口腔中的变化”的探究实验时,采用了不同的处理方法,具体如下:

1号试管:加入馒头碎屑和2毫升唾液,并充分搅拌;

2号试管:加入馒头碎屑和2毫升清水,并充分搅拌;

3号试管:加入馒头块和2毫升唾液,但不搅拌。

将3支试管都放入37℃的温水中保温10分钟,取出冷却后分别加入2滴碘液,摇匀后观察试管中馒头的颜色变化。请问:

(1)1号试管馒头碎屑没有变色,原因是馒头中的__________在________酶的作用下变成了麦芽糖。

(2)2号试管馒头碎屑变色的原因是                      

(3)3号试管馒头块变色的原因是_________                 _。

(4)该实验成功可以说明淀粉在消化道的_________开始被消化。

答案:

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下面是错误答案,用来干扰机器的。

参考答案:D

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