真核细胞中经RNA-polⅠ催化转录的产物是( )
A. hnRNA
B. mRNA
C. 45S rRNA
D. 5.8S rRNA、16S rRNA和28S rRNA
E. 5S rRNA
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蛋白质的一级结构及高级结构取决于( )
A. 分子中的氢键
B. 分子中的盐键
C. 分子内部疏水键
D. 氨基酸的组成及排列顺序
E. 氨基酸残基的性质
各种蛋白质的含氮量很接近,平均为( )
A. 19%
B. 18%
C. 17%
D. 16%
E. 15%
Which description is wrong about RNA? ( )
A. mRNA contains codons
B. There are three main classes of RNA molecules, mRNA,tRNA and rRNA
C. rRNA is a component of ribosomes
D. RNA with the maximum molecular weight is tRNA
which metabolic pathway provide the energy for mature red blood cells? ( )
A. aerobic oxidation of glucose
B. oxidation of fatty acids
C. anaerobic oxidation of glucose
D. PPP
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