If you have an identical twin, you and your twin are likely to have
A) an identical number of B cells, helper T cells, and cytotoxic T cells
B) identical major histocompatibility complex (MHC) proteins
C) identical antigens with similar immunogenicity and reactivity
D) identical antigen presenting cells (APCs)
E) an identical number of effector and memory cells

Question

Quizplus · Accepted Answer

Identical twins have the same genetic material and thus have identical MHC proteins, which are responsible for presenting antigens to T cells. This accounts for the high rate of successful organ and tissue transplants between identical twins. A, C, D, and E are not necessarily true as individual variation in immune responses can occur even between genetically identical individuals.

If You Have an Identical Twin, You and Your Twin