单项选择题

When nucleotides are polymerized, the triphosphate group of one nucleotide reacts with the 3’-OH (hydroxyl) group of another nucleotide.
A、正确
B、错误

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单项选择题

A 4 inputs single output AND gate circuit, making a NOT operation of the output signal. If the result is 0, which of the following answers is the input signal?( )

A．0000
B．0001
C．0010
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