Which of the following statements about B cells is correct?
B cells directly attack and kill infected cells.
B cells produce antibodies and are part of cell-mediated immunity.
B cells primarily recognize antigens presented by macrophages.
B cells are involved in phagocytosis of pathogens.
The Correct Answer is C
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.
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Related Questions
Correct Answer is A
Explanation
Explanation: T cells are a type of lymphocyte that plays a central role in cell-mediated immunity. They can recognize and destroy abnormal cells, including cancer cells, through direct cell-to-cell interactions.
Incorrect choices:
b. B cells produce antibodies in response to specific pathogens, but they do not directly attack cancer cells.
c. Antibodies are protein molecules that can bind to specific antigens on pathogens, but they do not have a direct role in attacking cancer cells.
d. Macrophages are phagocytic cells that engulf and destroy foreign substances, including pathogens, but they are not the primary cells responsible for recognizing and attacking cancer cells.
Correct Answer is C
Explanation
Explanation: Active immunity. Active immunity is acquired when the immune system is exposed to a pathogen, either through natural infection or vaccination. It results in the production of memory cells that provide long-term protection against future exposures to the same pathogen.
Incorrect choices:
a. Passive immunity is acquired when preformed antibodies are transferred from one individual to another. It provides immediate but temporary protection and does not involve the production of memory cells.
b. Innate immunity is the body's first line of defense against infections and provides immediate, non-specific protection, but it does not involve the production of antibodies specific to a particular pathogen.
d. Acquired immunity is a general term that includes both active and passive immunity, but it does not specifically describe the type of immunity acquired through vaccination or exposure to a specific pathogen.
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