The secondary immune response is characterized by:
A delayed and weaker response compared to the primary immune response.
The activation of naive B cells and T cells.
A rapid and robust response due to the presence of memory cells.
The production of IgM antibodies.
The Correct Answer is C
Explanation: The secondary immune response is faster and more potent than the primary immune response due to the presence of memory B cells and memory T cells. These memory cells "remember" the specific antigen from a previous encounter, allowing for a quicker and more effective immune response upon re-exposure to the same antigen.
Incorrect choices:
a. The secondary immune response is faster and stronger compared to the primary immune response, not delayed and weaker.
b. The secondary immune response involves the activation of memory B cells and memory T cells, not naive B cells and T cells.
d. The primary immune response is characterized by the production of IgM antibodies initially, but during the secondary immune response, the production of IgG antibodies predominates, which are more effective in neutralizing antigens.
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Related Questions
Correct Answer is A
Explanation
Explanation: B cells are a type of lymphocyte that produces antibodies against specific antigens. When a B cell encounters an antigen that matches its specific receptor, it becomes activated and differentiates into plasma cells, which are responsible for producing large quantities of antibodies that can target and neutralize the antigen.
Incorrect choices:
b. T cells are involved in cell-mediated immunity and do not produce antibodies. They recognize and directly attack infected or abnormal cells in the body.
c. Macrophages are antigen-presenting cells that engulf and process pathogens to present their antigens to other immune cells. They do not produce antibodies themselves but play a role in initiating the immune response.
d. Natural killer cells are a type of lymphocyte involved in the innate immune response. They do not produce antibodies but can directly kill infected or abnormal cells.
Correct Answer is B
Explanation
Explanation: Numerous scientific studies have found no link between vaccines and autism. The notion that vaccines cause autism was based on a discredited and fraudulent study, and subsequent research has shown no evidence of such a link.
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