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Which of the following cells is responsible for antigen recognition during the immune response?

A.

B cells

B.

Cytotoxic T cells

C.

Macrophages

D.

Red blood cells

Answer and Explanation

The Correct Answer is A

Explanation: B cells are a type of lymphocyte that plays a crucial role in the immune response by recognizing and binding to specific antigens. When a B cell encounters an antigen that matches its specific receptor, it becomes activated and differentiates into plasma cells, which produce antibodies against the antigen.

Incorrect choices:

b. Cytotoxic T cells are responsible for directly attacking and killing infected or abnormal cells during cell-mediated immunity. They do not primarily recognize antigens during the immune response.

c. Macrophages are antigen-presenting cells that engulf and process pathogens to present their antigens to other immune cells, such as T cells and B cells. While they are involved in antigen recognition, they are not the primary cells responsible for this function.

d. Red blood cells do not have a direct role in antigen recognition or the immune response. Their primary function is to transport oxygen throughout the body.


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Related Questions

Correct Answer is C

Explanation

Correct answer: C

A.B cells are part of the adaptive immune system and are responsible for antibody-mediated immunity. They do not directly attack and kill infected cells. Instead, B cells produce antibodies that can recognize and neutralize pathogens or foreign substances.

b. B cells are involved in antibody-mediated immunity, not cell-mediated immunity. They produce antibodies that circulate in the bloodstream and bind to antigens on pathogens, marking them for destruction by other immune cells.

c. B cells are crucial for recognizing "foreign" molecules (antigens) on pathogens and producing antibodies that can bind to those antigens. Macrophages engulf pathogens and present fragments (antigens) of them on their surface, allowing B cells to identify and target the specific pathogen.

d. Phagocytosis of pathogens is mainly carried out by macrophages and neutrophils, not B cells.

Correct Answer is C

Explanation

Explanation: Macrophages play a dual role in both innate and adaptive immunity. As part of the innate immune response, macrophages act as phagocytes, engulfing and destroying pathogens and debris in the body. They are also antigen-presenting cells, presenting processed antigens to other immune cells to initiate the adaptive immune response.

Incorrect choices:

a. B cells are part of the adaptive immune response and produce antibodies against specific antigens. They are not involved in the innate immune response.

b. T cells are primarily involved in the adaptive immune response and directly attack infected or abnormal cells. They are not part of the innate immune response.

d. Natural killer cells are part of the innate immune response and can directly kill infected or abnormal cells. They do not participate in the adaptive immune response.

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