Free LST Antigen Questions and Answers

Question 1

What is the primary function of lymphocytes in the immune system?

Accepted Answer

Fight infections and provide immunity

Answer

Produce red blood cells

Answer

Transport oxygen

Answer

Regulate blood pressure

Question 2

What are the main types of lymphocytes involved in antigen recognition?

Accepted Answer

T cells and B cells

Answer

Erythrocytes and leukocytes

Answer

Platelets and monocytes

Answer

Neutrophils and basophils

Question 3

What molecule on the surface of B cells is responsible for antigen recognition?

Accepted Answer

B cell receptor (BCR)

Answer

T cell receptor (TCR)

Answer

Major histocompatibility complex (MHC)

Answer

Complement proteins

Question 4

What is the role of T cell receptors (TCRs) in antigen recognition?

Accepted Answer

They bind to antigens presented by MHC molecules on antigen-presenting cells

Answer

They produce antibodies

Answer

They phagocytize pathogens

Answer

They release histamine

Question 5

Which type of MHC molecule presents endogenous antigens to CD8+ T cells?

Accepted Answer

MHC class I

Answer

MHC class II

Answer

MHC class III

Answer

MHC class IV

Question 6

What type of antigens do MHC class II molecules present?

Accepted Answer

Exogenous antigens

Answer

Self-antigens

Answer

Endogenous antigens

Answer

Viral antigens

Question 7

What is the initial event in the lymphocyte activation process?

Accepted Answer

Recognition of an antigen by a specific receptor on the lymphocyte

Answer

Proliferation of lymphocytes

Answer

Release of antibodies

Answer

Migration to the site of infection

Question 8

What is clonal expansion in the context of lymphocyte activation?

Accepted Answer

Rapid proliferation of lymphocytes that have recognized a specific antigen

Answer

Differentiation into various cell types

Answer

Secretion of cytokines

Answer

Phagocytosis of pathogens

Question 9

Which cells are considered professional antigen-presenting cells (APCs)?

Accepted Answer

Dendritic cells, macrophages, and B cells

Answer

Red blood cells and platelets

Answer

Neutrophils and eosinophils

Answer

Basophils and mast cells

Question 10

What cytokine is essential for the proliferation of activated T cells?

Accepted Answer

Interleukin-2 (IL-2)

Answer

Interleukin-1 (IL-1)

Answer

Interleukin-4 (IL-4)

Answer

Interferon-gamma (IFN-γ)