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
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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
Which vitamine is essential for methionine cycle?()
A. biotin
B. vitamine B12
C. vitamine B2
D. pyridoxal
Which is not one carbon unit?()
A. -CH2-
B. -CH3
CO2
When V = 80% Vmax in the enzyme-catalyzed reaction,the [S] will be how many times of Km? ( )
A. 7
B. 6
C. 5
D. 4
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