下列哪种物质不属于第二信使() A.cAMP B.Ca2+ C.cGMP D.IP3

题型:单项选择题

问题:

下列哪种物质不属于第二信使()

A.cAMP

B.Ca2+

C.cGMP

D.IP3

E.乙酰胆碱

考点:北京住院医师公共卫生学Ⅰ阶段生物化学生物化学题库
题型:单项选择题

Reading comprehension.

     Just the mention of the TOEFL, GRE and GAMT exams brings a thought of long hours of dull paper work.

But that idea is becoming increasingly out of date. As planned, computerized tests will begin next year which

will bring a series of changes from test psychology to scoring techniques.

     From computer-equipped rooms, examinees will answer the questions on a computer. If they are sure about

their choices, they can pass to the next question by pressing the entry (条目) "next". Then another question

will be randomly (任意地) selected from a vast test item bank and appear on the screen. After answering all the

questions, examinees can choose the entry "quit" if they are not satisfied with their performance or "score" if

they want to see the result. Scores will be calculated immediately and appear on the screen. By that point,

student's marks are official-there is no going back.

     Since they greatly shorten the painful waiting process-which used to be two or three months, computerized

tests have won worldwide popularity. Besides, there will be no rushing to the registration offices (登记处) for

these exams. Computerized tests will be given every workday in an exam center with all three kinds of tests

being held in the same room. All test takers need to do is to call the exam center and book their seats for a

particular day.

     In addition it will become technically possible to apply new testing procedures. In the past, each examinee

had the same set of test items despite differences in their ability. Under a computerized system, however, if the

computer judges an answer is right, a question of a relatively difficult nature will follow. But if an examinee

continues to give wrong answers and is judged as un-qualified by the computer system, he will be automatically

denied the chance to go further in the test.

1. Computerized tests allow the examinee to know their scores ______. [ ]

A. immediately on a central computer for scoring test papers

B. a few minutes after the exam with the help of a test center worker

C. on the next day after they have taken the exam

D. immediately after the exam by means of the same computer

2. If an examinee is not satisfied with his performance ______. [ ]

A. he can admit defeat and give it up

B. he can ask the computer to give some advice

C. he can ask another chance within a few days

D. he is allowed to do it once again

3. Under a computerized system, all of the following would be possible except that ______. [ ]

A. different exams can be taken in the same room

B. one doesn't need to rush to the registration officer for taking an exam

C. it will be much easier to pass an examination

D. one can take an exam almost at any time of the year

4. The word denied in the last sentence most probably means ______. [ ]

A. refused

B. allowed

C. lost

D. passed

题型:单项选择题

系统发生单相接地故障时,可以对接地变压器进行投、切操作。()

题型:单项选择题

土地登记面积与出让合同上的面积不一致时,以( )面积为准。

A.土地证上登记
B.出让合同上的
C.实际测量
D.委托方确定的

题型:单项选择题

用甲醛吸收SO2,吸收液温度在()℃为宜;Saltzman法测定NO2,吸收液温度在()为宜。若同时测SO2、NO2,吸收液温度应为().

题型:单项选择题

公路路面常用的基层与底基层结合料有______。

A.气硬性结合料
B.水硬性结合料
C.无机结合料
D.有机结合料
E.粒料结合料

更多题库