题目内容

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

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

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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

2．Which deamination is the main form in living organism?

A．transamination
B．oxidative deamination
C．coupled deamination
D．direct deamination

1．Which one is the essential amino acid?

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