Memory B cells are responsible for:
The production of antibodies during the primary immune response.
The activation of helper T cells.
Initiating the complement cascade.
Mounting a rapid and robust response during the secondary immune response.
The Correct Answer is D
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.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Explanation: Passive immunity is acquired when preformed antibodies are transferred to an individual, providing immediate but temporary protection against a specific pathogen. This can occur naturally from a mother to her newborn or artificially through administration of specific antibodies.
Incorrect choices:
a. Active immunity is acquired when the body's immune system is exposed to a pathogen and produces an immune response to provide protection against future infections.
c. Natural immunity refers to immunity that is acquired through natural exposure to a pathogen, either through infection or vaccination.
d. Herd immunity is the indirect protection that occurs when a large percentage of a population becomes immune to a disease, either through vaccination or previous infection, reducing the likelihood of transmission to susceptible individuals.
Correct Answer is C
Explanation
Explanation: Macrophages are a type of white blood cell that plays a crucial role in the innate immune response. They are phagocytes, meaning they engulf and destroy pathogens, cellular debris, and foreign substances in the body. Macrophages are also antigen-presenting cells, as they process and present antigens to other immune cells to initiate an adaptive immune response.
Incorrect choices:
a. B cells produce antibodies against specific antigens but do not directly engulf and destroy pathogens.
b. T cells are involved in cell-mediated immunity and directly attack infected or abnormal cells but do not have phagocytic capabilities like macrophages.
d. Natural killer cells are a type of lymphocyte involved in the innate immune response and can directly kill infected or abnormal cells, but they do not primarily function as phagocytes like macrophages.
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