Most eukaryotic mRNA 3′ terminus is ( ) A.poly
A. D.poly
B. C.poly
C. B.poly
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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
Which compound provide nitrogen for N3 and N9of purine ring ? ( )
A. Gln
B. Gly
C. Ala
D. Asp
The most abundant protein in plasma is ( )
A. albumins
B. α1-globular protein
C. α2-globular protein
D. β-globular protein
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