Aclass i mhc protein presents an antigen. what type of cell is likely presenting and to what type of cell would it be presented?

MHC I class of molecules appears on the cell surface of all nucleated cells and those cells are non-professional antigen presenting cells. Their function is to present an antigen to cytotoxic T cells (T lymphocytes).  After a viral or bacterial infection, MHC I molecules will present those foreign proteins on the surface and T cells specific for the MHC will recognize and kill presenting cell.

the sugar-phosphate backbone forms the structural framework of nucleic acids, including dna and rna. this backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.

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