为探究细胞通透性，将刚出生的小鼠肝细胞在体外培养一段时间后，检测培养液中的氨基酸、葡萄糖和尿素含量的变化(如下图)。请回答：
{图
(1)由图可知，培养时间延长，培养液中葡萄糖和氨基酸含量__________，尿素含量__________。由于原培养液中没有尿素，推测其是 __________ 的产物。
(2)氨基酸进人细胞后，其主要作用是__________；葡萄糖进入细胞后主要通过__________作用，为细胞提供能量。
(3)转氨酶是肝细胞内一种酶，正常情况下这类酶不会排除细胞外，若在细胞培养液中检测到该类酶，可能原因是__________。
(4)若将肝细胞放人清水中，会吸水涨破，结合(1)和(3)可初步判断，细胞膜对物质运输具有__________性。
正确答案及解析
正确答案
解析
包含此试题的试卷
你可能感兴趣的试题
我国保护少年儿童权益的专项法律是《中华人民共和国未成年人保护法》。（ ）
- 查看答案
根据以下材料，回答题
If you don′t think a phone is the rightgift for a lover, the smart choice this year is a smart phone.
For people who don′t read instructions
The easiest-to-use phone is the iPhone. It′sthat has pushed it to the No.1 selling position, surpassing the Motorola Razr.The iPhone′s touch screen is easy to operate and it′s also easy to customize (用户化). The iPhone can run allsorts of applications such as those help you to lose weight, identify a song onthe radio, find a restaurant or do many other things.
For the futurist
The T-Mobile G1 is very popular as it is thefirst phone to offer a Google browser, meaning that you′re getting the real webon your phone, but it′s the phone′s potential that qualifies it for the futurist.The exciting applications are interesting, but they don′t always work smoothly.Sometimes it is hard to use the applications it comes with. The system shouldimprove as it becomes more popular, so it holds great promise. With fewrestrictions on the design of applications for the phone,
the G1 could be the first phone toincorporate (整合) some of the coolest.
For the road warrior
The new BlackBerry Storm is something likethe equivalent (等同物) of a mullet--a business up front, party in the back. It stillincorporates the serious mail and organization features that have endeared (使受钟爱) these phones to business people. The 3.25-inch is bright anddetailed and it′s a decent size for watching videos on the go.
For the Luddite (反对技术进步的人)
For those who can′t handle buttons and newfeatures, there is the Samsung Jitterbug Dial. Some people are Luddites whojust want a few large buttons to make calls. That′s it, just calls. That makesit even easier to use an iPhone.
What would be the best title forthe passage (no more than 6 words)
________________________________________________________________________
- 查看答案
MP3（ ）。
-
- A.为具有最高的压缩比的图形文件的压缩标准
- B.采用的是无损压缩技术
- C.是目前很流行的音频文件压缩格式
- D.为具有最高的压缩比的视频文件的压缩标准
- 查看答案
简述学生的义务。
- 查看答案
依据《普通高中英语课程标准》，语言有丰富的文化内涵。教师应根据学生的年龄特点和__________ ，逐步扩展文化知识的内容和范围。
- 查看答案