Question

1. Which of the following complement activation pathways can be activated by antibodies? a. Lectin activation pathway b. Classical activation pathway c. Alternate activation pathway d. All of the above can be activated by antibodies. e. None of the above can be activated by antibodies. 2. Which of the following cells are leukocytes? a. NK cells b. neutrophils c. monocytes d. all of the above e, none of the above 3 Which of the following cells are lymphocytes? a. NK cells b. neutrophils c. monocytes d. all of the above e. none of the above 4. Why do complement proteins not damage healthy cells normally? a. Complement proteins must be produced by activated leukocytes. b. Complement proteins must be activated by enzymatic cleavage. c. Leukocytes have complement receptors that facilitate opsonization. d. All activation pathways of complement depend on antibodies e. Healthy cells cannot be damaged by activated complement protiens. 5. Which of the following statements are TRUE about immune cells? a. Antigen-loaded dendritic cells (DCs) enter the lymph node (LN) via the blood vessels while naive T cells ento via the afferent lymphatics. b. Both antigen-loaded DCs and naïve T cells enter LN via blood vessels. C Antigen-loaded DCs enter LN via afferent lymphatics while naive T cells enter LN via blood vessels. d. Both antigen-loaded DCs and naive T cells enter LN via the afferent lymphatics. e. The trafficking of antigen-loaded DCs and naive T cells within LN is random. 6. Memory T cells are generated a. upon second exposure to antigen. b. upon first exposure to antigen. c. upon repeated exposure to antigen. d. in the thymus e. in lymph nodes.

Answer 1

2) which of the following cells are leukocytes.

Ans) Neutrophil ans Monocytes are the following cells of leukocytes

LEUKOCYTES

A type of blood cell that is made in the bone marrow and found in the blood and lymph tissue. Leukocytes are part of the body's immune system. They help the body to fight against infection and diseases.

a) Natural Killer cells (also known as NK cells, K cells, ans killer cells) are a type of lymphocyte (a white blood cell) and a component of innate immune system. NK cells play a major role in the host rejection of both tumours and virally infected cells.so NK cells are not leukocytes.

b) Neutrophil is a type of immune cell that is one of the first cell types to travel to the site of an infection. Neutrophils helps fight infection by ingesting microorganisms and releasing enzymes that kills microorganisms.A neutrophil is a type of white blood cell, a type of granulocytes , and a type of phagocyte. so neutrophils are cells of leukocytes

c) Monocytes are type of leukocytes. They are largest type of leukocytes and can differentiate into macrophages an myeloid lineage dendritic cells. As a part of vertebrate innate immune system monocytes also influence the process of adaptive immunity. so Monocytes are cells of leukocytes.