Summary
Summary ( 4 Questions)
Antibodies are proteins produced by B lymphocytes that can recognize and bind to specific antigens, such as viruses, and mark them for destruction by other immune cells or mechanisms. Antibodies are part of the adaptive immune system, which provides specific and long-lasting immunity against pathogens.
Natural killer cells are lymphocytes that can directly kill infected or abnormal cells by releasing cytotoxic substances that induce apoptosis. Natural killer cells are part of the innate immune system, which provides nonspecific and immediate immunity against pathogens, but they do not directly kill viruses, which are intracellular parasites.
Macrophages are phagocytes that can engulf and digest foreign particles, such as bacteria, fungi, or cellular debris. Macrophages are part of the innate immune system, which provides nonspecific and immediate immunity against pathogens, but they are not very effective against viruses, which are intracellular parasites.
Complement proteins are plasma proteins that can activate a cascade of reactions that enhance inflammation, opsonization, and lysis of pathogens. Complement proteins are part of the innate immune system, which provides nonspecific and immediate immunity against pathogens, but they do not activate viruses, which are inert particles outside of host cells.
Choice A reason:
Antibodies are proteins produced by B lymphocytes that can recognize and bind to specific antigens, such as viruses, and mark them for destruction by other immune cells or mechanisms. Antibodies are part of the adaptive immune system, which provides specific and long-lasting immunity against pathogens.
Choice B reason:
Natural killer cells are lymphocytes that can directly kill infected or abnormal cells by releasing cytotoxic substances that induce apoptosis. Natural killer cells are part of the innate immune system, which provides nonspecific and immediate immunity against pathogens, but they do not directly kill viruses, which are intracellular parasites.
Choice C reason:
Macrophages are phagocytes that can engulf and digest foreign particles, such as bacteria, fungi, or cellular debris. Macrophages are part of the innate immune system, which provides nonspecific and immediate immunity against pathogens, but they are not very effective against viruses, which are intracellular parasites.
Choice D reason:
Complement proteins are plasma proteins that can activate a cascade of reactions that enhance inflammation, opsonization, and lysis of pathogens. Complement proteins are part of the innate immune system, which provides nonspecific and immediate immunity against pathogens, but they do not activate viruses, which are inert particles outside of host cells.