Which statement is true?

Question

Quizplus · Accepted Answer

MHC proteins are responsible for presenting antigens to T cells, allowing them to distinguish between self and nonself antigens. This helps prevent autoimmune reactions where the immune system attacks the body's own cells.

Answer: B
 Humans have three Class I MHC genes and three Class II MHC genes, which can combine in different ways to produce a large number of possible allele combinations. This genetic diversity is important for recognizing a wide range of potential pathogens.

Answer: False, there are four classes of MHC proteins (Class I, II, III, and IV). 
 MHC proteins are cell surface glycoproteins, not secreted into the extracellular space or circulated in the blood. They are anchored in the cell membrane and present antigens to T cells.

Answer: False, MHC genotypes are highly variable between individuals. 
 MHC genes are highly polymorphic, meaning that there are many variations between individuals. This variation allows the immune system to recognize a wide range of potential pathogens.

Which Statement Is True