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【多选题】
航空运输中集中托运有以下哪些特点 ( )。A.
节省运费
B.
延伸航空公司的服务
C.
弥补没有直达航班的不足
D.
提早结汇
E.
海鲜、活动物的运输
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反馈参考答案：
举一反三
【判断题】Compounding is the process of creating new words by combining affixes and bases.()
A.
正确
B.
错误
【单选题】She always ____ her opinion ____ facts.
A.
depends, on
B.
bases, on
C.
put, into
D.
bases, by
【多选题】How are purine and pyrimidine bases recycled by salvage pathways?
A.
Free purine and pyrimidine bases are constantly released in cells during the metabolic degradation of nucleotides. Free purines are in large part salvaged and reused to make nucleotides, in a pathway much simpler than the de novo synthesis of purine nucleotides described earlier.
B.
One of the primary salvage pathways consists of a single reaction catalyzed by adenosine phosphoribosyltransferase, in which free adenine reacts with PRPP to yield the corresponding adenine nucleotide.
C.
Free guanine and hypoxanthine (the deamination product of adenine ) are salvaged in the same way by hypoxanthine-guanine phosphoribosyltransferase.
D.
A similar salvage pathway exists for pyrimidine bases in microorganisms, and possibly in mammals.
【简答题】A．points B．stations C．establishments D．bases
【简答题】A．ends B．backgrounds C．origins D．bases
【简答题】A．points B．stations C．establishments D．bases
【单选题】Which of the following statements about minor bases is wrong?
A.
In DNA, the most common minor bases are acetylated forms of the major bases.
B.
In some viral DNAs, certain bases may be hydroxymethylated or glucosylated.
C.
Altered or unusual bases in DNA molecules often have roles in regulating or protecting the genetic information.
D.
Minor bases of many types are also found in RNAs, especially in tRNAs.
【单选题】Penicillin is not stable in all of the following bases EXCEPT ()
A.
anhydrous bases
B.
water-soluble bases
C.
sodium alginate
D.
emulsion base
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