INFER Which of the following statements describes the structure of nucleotides that
make up DNA? Select all correct answers.
a. All nucleotides have the same base.
b. All nucleotides have a phosphate group and deoxyribose.
c. Adenine has one more carbon-nitrogen ring than thymine.
d. Purines have one carbon-nitrogen ring.
e. Pyrimidines have one carbon-nitrogen ring.

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.