Which structures are common to all cell types? What are the functions of these essential structures

Recombinant dna is the merging of dna from unrelated organisms to create new genetic varieties is assembled in the lab from mononucleotides was part of the green revolution of the 1960s is pollination of one plant by another of the same species is cross-pollination of one plant by a different species

Can someone give me the answers to this?

Mattias scheiden and theodor schwann studied plant and aniaml cells under a microscope. together these men concluded that plants and aniamals are made up of cells, which scientist furthered their study to complete our mordern cell theory