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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>>
写词组 例如: The chores includes:
1) ________________________
2) ________________________
3) ________________________
4) ________________________
5) ________________________
首字母填空
Do you dream of having beautiful hair like a model? Well, you can have it if you look after your hair in the r 1 way.To get beautiful hair, you first n 2 to get healthy.So start eating good food, and start e 3 .This will make your hair look healthy and full of l 4 .You also need to keep your hair c 5 to make it look nice.But not many people know how to w 6 their hair in the right way.Many people wash their hair t 7 much.This m 8 their hair dry(使…变干)out.You should o 9 wash your hair every day if you have oily(油性的)hair.If you have normal(中性的)or dry hair, you should wash it e 10 two or three days.
书面表达:根据中文大意,写出意思连贯、符合逻辑、不少于60词的短文.所给英文提示词语供选用.
新年到了,同学们一定有很多想法.请以日记的形式,介绍自己在学习、身体、家务劳动、旅游等方面的计划,并针对自身的不足之处,说说你打算怎么做.
(日记的开头已经给出,其字数不计入所完成的短文内.)
提示词语:study hard, read, healthy food, exercise, help, chores, at home, travel
January 18, 2007 Wednesday Sunny
Now, it’s the year of 2007.I have a new plan for the New Year.I am going to ________
1. 你知道茶吗,就是在水之后世界上最受欢迎的饮品,是偶然之间发明的?
Did you know tea, the most popular drink in the world (after water), was ?
2. 它是3000多年以前由中国的皇帝,神农发明的。
It was invented Chinese emperor, Shen Nung over year sago.
3. 飞盘是在20世纪50年代,由大学生发明的。
The disk was invented by students in .
4. 算盘是由中国人民在6世纪时发明的。
The abacus was invented by Chinese people.
5. 她喜欢脆的小甜饼,它们硬,干而且易碎。
She likes crispy cookies. They are , and .
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