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> 在下表中甲、乙两只试管中分别放入等量的淀粉液,在此基础上请你设计一个探究淀粉类食物在口腔中变化的实验.完成表格:(1)实验要在______度的温水中处理.(2)冷却后加碘液,你-生物
在下表中甲、乙两只试管中分别放入等量的淀粉液,在此基础上请你设计一个探究淀粉类食物在口腔中变化的实验.完成表格:(1)实验要在______度的温水中处理.(2)冷却后加碘液,你-生物
题目简介
在下表中甲、乙两只试管中分别放入等量的淀粉液,在此基础上请你设计一个探究淀粉类食物在口腔中变化的实验.完成表格:(1)实验要在______度的温水中处理.(2)冷却后加碘液,你-生物
题目详情
在下表中甲、乙两只试管中分别放入等量的淀粉液,在此基础上请你设计一个探究淀粉类食物在口腔中变化的实验.完成表格:
(1)实验要在______度的温水中处理.
(2)冷却后加碘液,你观察到的现象是:甲试管______;乙试管:______.
(3)设置乙试管的目的是______.
(4)从上述的现象,我们得出的结论是______.
题型:解答题
难度:中档
来源:不详
答案
(1)本实验探究唾液淀粉酶对淀粉的作用,所以要保证唾液淀粉酶具有较强活性所需的温度--人体口腔内的温度(37℃左右),故将试管置于37℃的温水中处理.
(2)正常情况下,甲试管中的淀粉在唾液淀粉酶的作用下变成了麦芽糖,而乙试管中没有唾液淀粉酶,所以淀粉不会消失.当加碘液是甲试管不变蓝;乙试管变蓝.
(3)乙试管的目的就是要与甲试管形成对照.设计唯一变量--唾液淀粉酶,从而得出:淀粉在唾液淀粉酶的作用下被分解.
(4)由上面分析可得:淀粉在唾液淀粉酶的作用下变成了麦芽糖.
故答案为:(1)37
(2)不变蓝;变蓝
(3)作对照
(4)淀粉在唾液淀粉酶的作用下变成了麦芽糖
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题目简介
在下表中甲、乙两只试管中分别放入等量的淀粉液,在此基础上请你设计一个探究淀粉类食物在口腔中变化的实验.完成表格:(1)实验要在______度的温水中处理.(2)冷却后加碘液,你-生物
题目详情
(1)实验要在______度的温水中处理.
(2)冷却后加碘液,你观察到的现象是:甲试管______;乙试管:______.
(3)设置乙试管的目的是______.
(4)从上述的现象,我们得出的结论是______.
答案
(2)正常情况下,甲试管中的淀粉在唾液淀粉酶的作用下变成了麦芽糖,而乙试管中没有唾液淀粉酶,所以淀粉不会消失.当加碘液是甲试管不变蓝;乙试管变蓝.
(3)乙试管的目的就是要与甲试管形成对照.设计唯一变量--唾液淀粉酶,从而得出:淀粉在唾液淀粉酶的作用下被分解.
(4)由上面分析可得:淀粉在唾液淀粉酶的作用下变成了麦芽糖.
故答案为:(1)37
(2)不变蓝;变蓝
(3)作对照
(4)淀粉在唾液淀粉酶的作用下变成了麦芽糖