How many protons and electrons would be present in total, in a neutral lead (pb) atom? (hint: neutral means that the overall charge of the atom is equal to 0) wouldn't it still be 82? ? or would it be 0? ! : )

Imagine a self-reactive t cell that has not undergone clonal deletion in the thymus (that is to say, it has escaped central tolerance). if it encounters self antigen in the absence of an infection or inflammation, what will happen to this self-reactive t cell? (select two answers) (a) the t cell undergoes clonal expansion. (b) the t cell gains effector functions. (c) the t cell undergoes apoptosis. (d) the t cell becomes activated. (e) the t cell becomes anergic.