Which base is found only in RNA but not in DNA? ( )
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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
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
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