The nucleus has

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(D) The nucleus is enclosed by a nuclear envelope,which consists of two parallel membranes with a space between them called the perinuclear space.Thes

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Two membranes with pores through which macromolecules may pass

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(D) The nucleus is enclosed by a nuclear envelope,which consists of two parallel membranes with a space between them called the perinuclear space.These membranes are interrupted by minute pores,known as nuclear pores.These pores are formed by the fusion of the two nuclear membranes.Nuclear pores allow the movement of $RNA$ and protein molecules in both directions between the nucleus and the cytoplasm,thus facilitating the passage of macromolecules.

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