Lymphocytes Usually First Encounter Their Foreign Antigen In ______.

Question: What is an infectious agent?

Answer: can be a bacteria, virus, protozoan, multicellular parasite or fungus - any type of microorganisms that causes harm to the body or possibly death.

Question: What is a pathogenic agent?

Answer: Infectious agents that cause harm to the host.

Question: What are the 5 major categories of pathogens?

Answer: 1. Bacteria

2. Viruses

3. Fungi

4. Protozoans

5. Multicellular Parasites

Question:

Answer: Cellular immunity directly attacks pathogens and infected cells, while humoral immunity releases antibodies to do so.

Question: After T- and B-lymphocytes are formed, they migrate to

red bone marrow.

yellow bone marrow.

the thymus gland.

secondary lymphatic structures.

Answer: secondary lymphatic structures

Question: Cytotoxic T cells interact with target cells by recognizing

foreign proteins only.

MHC proteins only.

foreign protein−MHC protein complexes.

foreign proteins or MHC proteins.

neither foreign proteins nor MHC proteins.

Answer: foreign protein-MHC protein complexes.

Question: The CD8 protein binds

B-lymphocyte receptors.

MHC class I molecules.

MHC class II molecules.

antigen directly.

Answer: MHC class I molecules.

Question: A patient infected with a virus will likely have a high antibody titer, indicating elevated immune activity.

True or False

Answer: True

An antibody titer is the blood concentration of antibody. An elevated concentration of antibody indicates an infection.

Question:

Answer: 1. True

2. True

3. False

4. True

Question: Interferon:

is produced as a specific response to a specific virus.

stimulates macrophages and NK cells to destroy virus infected cells. able to save the cell that makes it.

induces production of mRNA in the recipient cell.

kills all bacteria nonspecifically.

Answer: Stimulates macrophages and NK cells to destroy virus infected cells.