Products of complete hydrolysis of RNA and DNA include ( )
A. the same ribose but partially different bases
B. the same bases but different ribose
C. the different ribose and partially different bases
D. the different bases but same ribose
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Which description is wrong about RNA? ( )
A. mRNA contains codon
B. There are three main classes of RNA molecules, mRNA,tRNA and rRNA
C. The rRNA is a component of ribosomes
D. RNA with the maximum molecular weight is tRNA
Most eukaryotic mRNA 3′ terminus is ( ) A.poly
A. D.poly
B. C.poly
C. B.poly
The ultraviolet absorption of nucleic acid with maximum at about ( )
A. 280nm
B. 220nm
C. 260nm
D. 340nm
Which one is true about the active center of the enzyme? ( )
A. the portion that only combines with the substrate
B. the portion that combines with substrate but does not exert the catalysis
C. the portion that only catalyzes the substrate to the product
D. the region for binding substrates and catalyzing substrates to products
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