Complement proteins:
All of the answers are correct
Attract phagocytes
Promote inflammation
Destroy cells
The Correct Answer is A
A. All of the answers are correct — Complement proteins are part of the immune system and contribute to defense in multiple ways:
B. They attract phagocytes to the site of infection through chemotaxis, enhancing the immune response.
C. They promote inflammation by increasing vascular permeability and attracting immune cells.
D. They can destroy cells by forming the membrane attack complex (MAC), which creates pores in the membranes of pathogens, leading to cell lysis.
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Related Questions
Correct Answer is C
Explanation
A. Vaccines are preparations that stimulate the immune system to produce an immune response, but they are not classified as killer, helper, regulator, or memory cells.
B. Antibodies are proteins produced by B cells that help neutralize pathogens, but they are not classified as killer, helper, regulator, or memory cells.
C. Granulocytes are a type of white blood cell that includes neutrophils, eosinophils, and basophils, involved in the immune response. However, the correct classification of cells as "killer, helper, regulator, and memory" specifically refers to T cells (not granulocytes). T cells are the cells responsible for these roles:
Correct Answer is C
Explanation
A. Neutrophils are a type of white blood cell that primarily responds to bacterial infections and perform phagocytosis, not specifically attacking tumor or virus-infected cells.
B. Regulatory T cells help regulate the immune response and prevent excessive immune activity, but they do not directly attack tumor or virus-infected cells.
C. Natural killer (NK) cells are a type of lymphocyte that plays a key role in the body's defense against tumor cells and virus-infected cells by directly attacking and destroying them.
D. Memory T cells are responsible for "remembering" a previous pathogen, enabling a quicker response upon future exposure, but they do not directly attack tumor or virus-infected cells.
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