True or False: Vaccines can cause autism in children.

xplanation: Memory B cells are formed during the primary immune response and play a critical role in the secondary immune response. When re-exposed to the same antigen, memory B cells quickly differentiate into plasma cells that produce large quantities of specific antibodies, leading to a rapid and robust immune response.

Incorrect choices:
a. The production of antibodies during the primary immune response is primarily carried out by plasma cells, not memory B cells.
b. The activation of helper T cells is essential for coordinating the immune response, but memory B cells are not directly responsible for this process.
c. The initiation of the complement cascade is a separate component of the immune response involving complement proteins, and memory B cells are not directly involved in this process.

Explanation: The secondary immune response provides long-lasting immunity because of the presence of memory B cells and memory T cells. These memory cells "remember" the specific antigen and can quickly mount a strong and effective immune response upon re-exposure to the same antigen, providing long-term protection.

Incorrect choices:

a. The primary immune response is primarily mediated by IgM antibodies, while the secondary immune response involves the predominance of IgG antibodies, which are more effective and provide long-lasting immunity.

b. The secondary immune response occurs after the primary immune response and is faster, not slower, due to the presence of memory cells.

c. Memory cells are a key component of the secondary immune response, playing a central role in providing rapid and robust immunity.

VI. Immune Disorders and Clinical Considerations: