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【单选题】
常染色质是指间期细胞核中( )?A.
螺旋化程度低、染色浅、无转录活性的染色质
B.
螺旋化程度低、染色浅、有转录活性的染色质
C.
螺旋化程度高、染色深、无转录活性的染色质
D.
螺旋化程度高、染色深、有转录活性的染色质
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