Final answer:
The nuclear envelope consists of two membranes separated by nuclear space, with nuclear pores at fused sites, and the inner surface lined by the nuclear lamina. All three provided statements about the nuclear envelope are correct.
Step-by-step explanation:
The nuclear envelope consists of two membranes separated by nuclear space, the two membranes are fused at sites forming a nuclear pore, and the inner surface of the nuclear envelope is lined by the nuclear lamina. Therefore, the correct answer to the question is that statements 1, 2, and 3 are all true.
The outer and inner membranes of the nuclear envelope are composed of phospholipid bilayers. The outer membrane is continuous with the rough endoplasmic reticulum. Nuclear pores are crucial as they control the movement of molecules such as RNA and proteins, facilitating communication between the nucleus and the cytoplasm. The nuclear lamina is a meshwork of intermediate filaments that lends support and shape to the nucleus. This sophisticated structure ensures genetic material within the nucleus is protected and interactions with the rest of the cell are regulated.