t cells bind to antigens that have been engulfed, digested, and presented on the surface of a(n)

Answer;

-Antigen presenting cells

Explanation;

-Helper T cell and inflammatory T cell TCRs recognise epitopes displayed by MHC class II molecules on the surface of antigen-presenting immune cells, including: macrophages that engulf foreign particles such as bacteria; dendritic cells that present antigen to T cells; and B cells that produce antibodies.

-Antigen-present cells APCs engluf antigens, present fragments of antigens to be recognized by T cells . Major types; dendritic cells in connective tissues and epidermis, macrophages in connective tissues and lymphoid organs &B cells.

each of the 46 original chromosomes splits into two daughter chromosomes, so there are two sets of 46 daughter chromosomes that end up in each cell. human cells have 46 chromosomes. each chromosome consists of a pair of identical chromatids attached together by a structure called a centromere.

it takes hundreds of years to become stable.

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