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 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 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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