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A.将不同切片放在不同温度的蒸馏水中处理1分钟后取出。
B.再分别放在清水中浸泡1小时而获得不同的切片浸出液。
C.测量这些溶液的花青素吸光度,得结果如下图。
请回答以下问题:
(1)上述实验操作步骤的叙述存在着一个明显的不足,没有遵循实验设计的 原则。请你对上述实验中的不准确的操作重新进行叙述: 。
(2)由上图中的曲线你可以得出的结论是 。
(3)已知物质A能促进细胞膜上载体的活性。有人认为:经过不同温度的处理是影响了细胞膜上运载花青素的载体的活性。请你借助上述材料设计实验证明该观点是否正确。
材料用具:略。
实验步骤:
① ;
② ;
③ 。
(2)预测结果及结论:
① ;
② ; 查看习题详情和答案>>
根据所给提示,完成句子。每空一词,含缩略词。
1. Lily swims faster than the other students in her class.(改为同义句)
Lily_______ _________in her class.
2. I think her dress is beautiful. (对划线部分提问)
_______ do you _________ of her dress?
3.I went to the park last Sunday. (改为否定句)
I ________ _________ to the park last Sunday.
4. 他决定了在北京学习。(完成译句)
He _________ _________study in Beijing.
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A)按要求改写下列各句。每空一词(含缩略形式)。
1.Linda plays tennis with her sister. (改为一般疑问句)
Linda tennis with her sister?
2.He likes his history teacher.(改为否定句)
He his history teacher.
3.They are my good friends. ( 用she替换they改写句子)
She my good .
4.Alice’s dog is on the chair.(对划线部分提问)
Alice’s dog?
5.We have Chinese on Wednesday afternoon. (对划线部分提问)
you have Chinese?
B)根据所给的汉语意思完成句子。每空一词(含缩略形式)
6.你弟弟喜欢香蕉吗?
your brother bananas?
7.他认为棒球难。
He baseball is .
8. 他们的钥匙在哪里?
their keys?
9.英语对我来说很简单。
English is very me.
10.我们有特价销售的紫色毛衣。
We have purple sweaters .
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根据所给提示,完成句子。每空一词,含缩略词。
1.Chen Ping received an e-mail last Friday. (改为否定句)
Chen Ping an e-mail last Friday.
2.There are fifty students in our class. (对划线部分提问)
students are there in your class?
3.I often borrow a dictionary from Bruce. (改为同义句)
Bruce often his dictionary me.
4.交卷前你应仔细检查。(完成译句)
You should check your answers carefully before you your paper.
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