Which statement is true about a cell wall but not a cell membrane? a: it forms the outer layer of a cell. b: it gives an animal cell its shape. c: it is selectively permeable. d: it is made mostly of cellulose.

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.