下列序列中哪个可能是Ⅱ类限制酶的识别序列() A.ATATCG B.CCCTGG C

题型:单项选择题

问题:

下列序列中哪个可能是Ⅱ类限制酶的识别序列()

A.ATATCG

B.CCCTGG

C.GATATC

D.AGCCGA

E.GAGTC

考点:临床医学检验临床化学临床化学综合练习临床化学综合练习题库
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已知向量
a
=(3,1),
b
=(x,-3),若
a
b
,则x=(  )
A.1B.2C.3D.4
题型:单项选择题
    Do you always understand the instructions on a bottle of medicine? Here’s one for John. John is twelve years old. He had a bad cold and coughed(咳嗽) day and night. He went to see a doctor and was given some cough medicine. Please read the following instructions and if you can understand them.
Cough Medicine:
The medicine is for a person with a cough. Shake it well before use.
Take it three times each day before meals or before sleep.
Dose (药量):
Age: over 14     2 teaspoonfuls
8~13      1 teaspoonful
4~7       1/2 teaspoonful
Dot fit for children below the age of three or old persons with heart trouble. Put it in a cold place. Use it before December 1st, 2004.
小题1:John should take ____________ a day.
A.2 teaspoonfulsB.3 teaspoonfulsC.4 teaspoonfulsD.1 teaspoonful
小题2:John should ___________ before he takes it.
A.shake the medicine wellB.eat nothingC.do some exercisesD.drink a cup of tea
小题3:When people are ____________ years old, they cannot take this medicine.
A.eightyB.thirtyC.twoD.twelve
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