What is the functional connection between the nucleolus, nuclear pores, and the nuclear membrane?

• A. The nuclear pores are connections between the nuclear membrane and the endoplasmic reticulum that permit ribosomes to assemble on the surface of the ER.
• B. The nucleolus contains messenger RNA (mRNA), which crosses the nuclear envelope through the nuclear pores.
• C. Membrane of the endoplasmic reticulum is produced in the nucleolus and leaves the nucleus through the nuclear pores.
• D. None of the listed responses is correct.
• E. Subunits of ribosomes are assembled in the nucleolus and pass through the nuclear membrane via the nuclear pores.