Immunology

A "non-self" substance that can provoke an immune response is called: a. Colony-stimulating factor. b. Antigen. c. Antibody. d. Immunoglobulin

b. Antigen

Major histocompatibility complex (MHC) refers to a large group of genes coding for proteins that play an essential role in which of the following? a. Phagocytosis by macrophages b. Antigen presentation to T lymphocytes c. Phagocytosis by neutrophils d. Antigen presentation to B-lymphocytes

b. Antigen presentation to T lymphocytes

The diversity region in T cell receptor is present on what part of the receptor? a. Alpha chain b. Beta chain c. Both alpha and beta chain d. Theta chain.

b. Beta chain

Types of immunity in humans are: a. Internal and external. b. Innate and acquired/adoptive. c. Intrinsic and extrinsic. d. Overt and covert.

b. Innate and acquired/adoptive.

NK cells recognize and target which cells? a. MHC-I high b. MHC-I low c. MHC-II d. Both MHC-I and MHC-II

b. MHC-I low

The physical barriers that act as primary defense are which of the following? a. The skin, body temperature and the mucosal membranes. b. The skin and the mucosal membranes. c. The bones and the mucosal membranes. d. The nails and the mucosal membranes.

b. The skin and the mucosal membranes.

Interaction of B7 expressed on DC with ________ expressed on the naive T cell is required for T-cell activation. a. CD4 b. CD16 c. CD28 d. CD40

c. CD28

Central tolerance refers to which of the following processes? a. Destruction of lymphocytes that are not specific for self-antigens. b. Destruction of self-antigens that are specific for lymphocytes. c. Destruction of lymphocytes that are specific for self-antigens. d. Production of self-antigens that are specific for lymphocytes.

c. Destruction of lymphocytes that are specific for self-antigens.

Active artificially acquired immunity is a result of which of the following? a. Antibodies passed on from mother to baby through breast milk. b. Antibodies passed on from mother to fetus through the placenta. c. Vaccination. d. Injection of an immune serum.

c. Vaccination

This immune cell is able to respond quickly after any subsequent encounter with the same antigen: a. Antigen-presenting cell. b. Helper T cell. c. Cytotoxic T cell. d. Memory Cell.

d. Memory Cell.