The estimated number of distinct structures that can be recognized by the mammalian adaptive immune system is
A)1-10
B)10²-10³
C)10³-10⁵
D)10⁷-10⁹
E)∞

Question

Quizplus · Accepted Answer

Although the theoretical number of antigen specificities of the adaptive immune system is higher, estimates of the actual number of different antibody and T cell antigen receptor specificities are in the range of 10⁷-10⁹. This number is large enough to accommodate most of the diversity in molecular structures that the microbial world is capable of producing.

The Estimated Number of Distinct Structures That Can Be Recognized