题目内容

Which one is the key enzyme in the ornithine cycle?()

A. arginase
B. argininosuccinate lyase
C. argininosuccinate synthetase
D. ornithine carbamoyl transferase

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The product of replication is ( )

A. RNA
B. DNA
C. protein
D. dNTP

Which can carry one carbon unit in living organism?()

A. vitamine B12
B. folic acid
C. tetrahydrofolate
D. biotin

Which one is the essential amino acid?

A．glycine
B．methionine
C．tyrosine
D．Glutamine

1．Which is not one carbon unit?

A．=CH－
B．－CH2－
C．―CH3
D．CO2