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【单选题】
以下操作习惯不利于光驱保护的是A.
防止灰尘进入
B.
光驱运行时不震动电脑
C.
利用程序开、关光驱仓盒
D.
常用餐巾纸擦光盘
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反馈参考答案：
举一反三
【单选题】Which amino acid can produce γ-aminobutyric acid by decarboxylation?
A.
ornithine
B.
glutamic acid
C.
aspartic acid
D.
tryptophan
E.
glycine
【单选题】Which of the following amino acid can produce PAPS?
A.
taurine
B.
methionine
C.
cysteine
D.
homocysteine
E.
glutamate
【多选题】Which of the following amino acid residues in enzyme molecule can be modified by phosphorylation
A.
Tyr
B.
Cys
C.
Ser
D.
Gly
E.
Thr
【单选题】Which of the following amino acid can not produce one carbon unit?
A.
Serine
B.
Valine
C.
Tryptophan
D.
Histidine
E.
Glycine
【单选题】Which amino acid can produce α-ketoglutaric acid directly by deamination
A.
tryptophane
B.
glycine
C.
phenylalanine
D.
tyrosine
E.
glutamic acid
【单选题】Which of the following amino acid can produce PAPS?
A.
taurine
B.
methionine
C.
cysteine
D.
homocysteine
E.
glutamate
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