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(1)若图甲是癌细胞的细胞膜,则膜上含量较正常细胞减少的物质是[ ] 。
(2)若图甲是线粒体膜,b和c过程运输的气体分别是 。b、c运输方式符合图 所表示的物质运输曲线。
(3)若图甲表示人体红细胞膜,则表示Na+、K+运输的分别是图中 。Na+、K+的运输方式符合图 所示曲线。
(4)已知红细胞吸收葡萄糖是协助扩散,而有人认为小肠上皮细胞以主动运输的方式吸收葡萄糖,请设计实验加以确定。
①实验步骤:
第一步:取甲、乙两组生理状况相同的小肠上皮细胞,放入适宜浓度的含有葡萄糖的培养液中。
第二步:甲组细胞给予正常的呼吸条件, 。
第三步: 。
②预测实验结果并分析:
a.若甲、乙两组细胞对葡萄糖的吸收速率基本相同,则 。
b. 。 查看习题详情和答案>>
词汇运用,根据短文内容和所给中文提示,写出空白处各单词的正确形式,每空限填一词。
Good 1 (下午)! I am a Chinese girl.You can call 2 (我)Nancy.My 3 (最喜欢的)subject is English.Every morning, I 4 (打开)the English book and 5 (听)to the radio.
Do you 6 (知道)that boy? He is my 7 (弟弟).He is 8 (十五)years old.He likes 9 (星期二), because he can 10 (游泳)on that day.
朗读下面的对话,并运用后面列出的交际用语把该对话完成,注意其中有两项为多余选项。
-Hi, Jeff, can you come to my party on Saturday?
-________
-It's at seven o'clock.
-________
-Mary, can you come to my party?
-________ I have to study for a test.
-What about you, Dave?
-I'm sorry , too. ________
[ ]
①He's not feeling well.
②I have a piano lesson.
③What time is it?
④Sorry, I can't.
⑤Great, I'd love to.
⑥Sure, I can.
查看习题详情和答案>>朗读下面的对话,并运用后面列出的交际用语把该对话完成,注意其中有两项为多余选项。
-________
-I usually get up at six o'clock in the morning.
-________
-I usually take the bus.
-Do you take the bus every day?
-________
-________
-It's five miles.
-________
-It takes about twenty-five minutes.
[ ]
①How often do you get to school?
②How far is it from your home to school?
③No, sometimes I ride my bike.
④What time do you get up every day?
⑤How long does it take you to get from home to school?
⑥How do you get to school?
⑦Sorry, I don't know.
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