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请根据文字描述编发WW电码____(只编发两位数字):观测时有由测站或测站附近的风吹起来的扬沙或尘土,但还没有发展成完好的尘卷沙尘暴;或飞沫吹到观测船上
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举一反三
【多选题】生产力的客观性在于( )
A.
它是在人与自然之间物质变换过程中形成的特殊的物质力量
B.
它不是前人实践活动的客观结果
C.
它是人们当前生产实践的既定前提和物质基础
D.
它是一种纯粹的自然力量
【单选题】In nucleic acids, the way to connect nucleotides is( )
A.
2',3'-phosphoresce bond
B.
3',5'-phosphoresce bond
C.
2',5'-phosphoresce bond
D.
Glycosidic bond
【多选题】What are the role of sugar nucleotides (e.g. UDP-glucose) in the biosynthesis of glycogen and many other carbohydrate derivatives?
A.
Many of the reactions in which hexoses are transformed or polymerized involve sugar nucleotides, compounds in which the anomeric carbon of a sugar is activated by attachment to a nucleotide through a phosphate ester linkage.
B.
Sugar nucleotides are the substrates for polymerization of monosaccharides into disaccharides, glycogen, starch, cellulose, and more complex extracellular polysaccharides.
C.
They are also key intermediates in the production of the aminohexoses and deoxyhexoses found in some of these polysaccharides, and in the synthesis of vitamin C (L-ascorbic acid).
D.
UDP-glucose is the immediate donor of glucose residues in the reaction catalyzed by glycogen synthase, which promotes the transfer of the glucose residue from UDP-glucose to a nonreducing end of a branched glycogen molecule.
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