What structure contains nuclear pores that control molecule movement between the nucleus and cytoplasm?

The structure that contains nuclear pores and is responsible for controlling the movement of molecules between the nucleus and the cytoplasm is the nuclear envelope. The nuclear envelope is a double membrane structure, composed of an inner and outer membrane, that encases the nucleus. The nuclear pores, which are large protein complexes embedded in this envelope, facilitate the selective passage of ions, RNA, and proteins while preventing the free diffusion of larger molecules. This selective barrier is crucial for maintaining the distinct environments of the nucleus and cytoplasm, allowing for the regulated exchange of materials necessary for cellular function.

The term "nuclear membrane" is often used interchangeably with "nuclear envelope," but the more precise term regarding the structure that includes the pores is "nuclear envelope." The term "nuclear capsule" is not commonly used in biological terminology related to the nucleus, and "nucleoplasm" refers to the substance within the nucleus, not the membrane that encloses it. Hence, the nuclear envelope is recognized for its critical role in nuclear transport due to the presence of nuclear pores.