MedMicro ch15-17 test

Front

What is phagocytosis?

Back

Phagocytosis is the process by which certain cells, known as phagocytes, engulf and digest pathogens and debris. It is a key mechanism of the immune system.

Front

What happens to pathogens in phagolysosomes?

Back

Pathogens are killed in phagolysosomes by acid and oxidative radicals, which are produced to destroy the engulfed material.

Front

What does a high titer against a virus in a neutralization test indicate?

Back

It indicates that the sample contains a high concentration of virus antibodies, suggesting a strong immune response.

Front

What is artificially acquired active immunity?

Back

Artificially acquired active immunity is immunity gained through vaccination, where exposure to a harmless form of a pathogen stimulates the immune system to produce antibodies.

Front

Which class of antibody can cross the placenta?

Back

IgG is the class of antibody that can cross the placenta from mother to fetus, providing passive immunity to the newborn.

Front

What must occur before exogenous antigens are presented by APCs?

Back

The pathogen must be internalized by the antigen-presenting cell (APC) and then catabolized to create peptide antigens.

Front

What role do opsonins play in phagocytosis?

Back

Opsonins are molecules that enhance phagocytosis by marking pathogens for destruction, making them more recognizable to phagocytes.

Front

What is the function of MHC class I molecules?

Back

MHC class I molecules present endogenous antigens to CD8+ T cells, playing a crucial role in the immune response against intracellular pathogens.

Front

What is the difference between active and passive immunity?

Back

Active immunity is developed through exposure to pathogens or vaccination, while passive immunity is acquired through the transfer of antibodies from another individual.

Front

What is the significance of the virus neutralization test?

Back

The virus neutralization test measures the ability of antibodies in a sample to neutralize a virus, indicating the presence and strength of the immune response.