Final answer:
The F pilus in bacteria and the nuclear envelope in eukaryotic cells are structures involving the passage or protection of genetic material.
Step-by-step explanation:
The structure that allows for the passage of genetic material in bacteria during the process known as bacterial conjugation is the F pilus, or sex pilus. The donor cell uses the F pilus to attach to the recipient cell enabling the transfer of a plasmid, which often contains beneficial or antibiotic resistance genes. In eukaryotic cells, genetic material is housed within the nucleus and is exchanged during processes like meiosis and fertilization. The nuclear envelope, studded with protein-lined pores, is crucial for the transport of macromolecules such as RNA and proteins, but does not generally facilitate direct transfer of genetic material between cells.