What is the distinction between immunogenicity and antigenicity?

Immunogenicity triggers immune response.

• Immunogenicity causes immune activation.

• Antigenicity involves binding to antibodies.

• Both concepts are crucial in vaccines.

Which type of epitope is recognized by T-cells?

T-cells generally recognize sequential (linear) epitopes.

What defines haptens in relation to immunogenicity?

Haptens are small molecules that are antigenic but lack immunogenicity unless they are bound to a larger carrier protein.

Which factor does not influence the immunogenicity of an antigen?

The color of the antigen does not influence immunogenicity.

What role do adjuvants play in immunology?

Adjuvants enhance the immunogenicity of an antigen, making vaccines more effective.

Which of the following is a bacterial superantigen? A) TSST B) IgG C) C3 convertase D) MHC-I

A) TSST

What is the primary structure of antibodies?

Antibodies consist of four polypeptide chains: two light chains and two heavy chains.

Which immunoglobulin class is responsible for type I hypersensitivity reactions?

IgE is responsible for type I hypersensitivity reactions.

How are monoclonal antibodies produced?

Monoclonal antibodies are produced by fusing a specific B-cell with an immortal myeloma cell to create a hybridoma.

What is the function of the Fab region of an antibody?

The Fab region binds to specific antigens.

Which immunoglobulin has the longest half-life?

IgG has the longest half-life, approximately 23 days.

What is the main purpose of the complement system?

The complement system enhances the immune response through opsonization, lysis of pathogens, and inflammation.

In which complement pathway is the antigen-antibody complex essential?

The classical pathway requires the antigen-antibody complex for activation.

Which immunoglobulin is the first to appear after an infection?

IgM is the first antibody to appear after an infection.

What type of reaction does the agglutination test measure?

The agglutination test measures the clumping of particles when an insoluble antigen is mixed with its corresponding antibody.

Which of the following tests uses sheep red blood cell antigens? A) Widal Test B) Paul-Bunnell Test C) Coombs Test D) ELISA

B) Paul-Bunnell Test

What is the role of aminopterin in HAT medium?

Aminopterin blocks the de novo pathway, forcing cells to use the salvage pathway for purine synthesis.

How are allotypes defined in the context of immunoglobulins?

Allotypes are antigenic markers present in the isotype genes of heavy and light chains, determined by various alleles.

What does the term 'idiotopes' refer to?

Idiotopes refer to unique antigenic determinants found in the variable region of antibodies.

Which immunoglobulin is primarily responsible for mucosal immunity?

IgA is primarily responsible for mucosal immunity.

Which test is used to detect antibodies against Treponema pallidum?

The Treponema pallidum immobilization test is used to detect antibodies against T. pallidum.

Which of the following best describes the difference between immunogenicity and antigenicity?

Immunogenicity provokes immune response.

• Immunogenicity triggers immune response.

• Antigenicity involves specific binding.

• Both concepts are crucial in immunology.

What is the function of adjuvants in vaccines?

Adjuvants enhance the immunogenicity of antigens, increasing the effectiveness of vaccines.