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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 B

Explanation

Explanation:The body's ability to produce antibodies against specific pathogens. Immunity refers to the body's ability to recognize and respond to specific pathogens, such as bacteria or viruses, by producing antibodies that target and neutralize these invaders.

Incorrect choices:

a. The body's ability to tolerate foreign substances without a response is not immunity but rather the concept of immunological tolerance, which prevents the immune system from attacking the body's own cells and tissues.

c. Immunity does not guarantee the prevention of infections, but it provides protection and reduces the severity of infections upon subsequent exposures to the same pathogen.

d. While the immune system is designed to fight off infections, it is not capable of fighting off all types of infections equally. The immune response is specific to the type of pathogen encountered.

Correct Answer is C

Explanation

Explanation: The pneumococcal polysaccharide vaccine is recommended for older adults to protect against pneumonia caused by Streptococcus pneumoniae bacteria. The influenza vaccine is recommended annually for people of all ages to prevent the flu.

Incorrect choices:

a. The hepatitis B vaccine is not specifically recommended for older adults to prevent pneumonia.

b. The influenza vaccine protects against the flu, not pneumonia.

d. The HPV vaccine is recommended for adolescents and young adults, not older adults, and does not protect against pneumonia.

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