Microbiology: A Systems Approach 4th Edition by Marjorie Kelly Cowan

Exercise 41

Critical thinking is the ability to reason and solve problems using facts and concepts. These questions can be approached from a number of angles and, in most cases, they do not have a single correct answer.
a. Summarize how T cells are stimulated by antigen, and compare this process with how B cells are activated.
b. Define the term tolerance, and explain whether it is necessary for effective humoral and cell-mediated immunity.