The Immune System

Which of the following is the name for a micro-organism that can cause disease?

• Pathogen

• Antibodies

• B-cells

• Lymphocyte

What is the molecule located on the outside of a pathogen that the immune system recognizes?

• Lymphocyte

• Antigen

• Pathogen

• Inflammation

What attaches to antigens and tags the pathogen for destruction?

• Pathogen

• Antibodies

• B-cells

• Lymphocyte

What is the ability to resist the pathogens that cause a particular disease?

• defense

• immunity

• immune system

When the body encounters a pathogen, antibodies are created that are specific to that pathogen. The next time the body encounters the pathogen, the response will be:

• Slower

• Faster

The diagram shows a pathogen, what is the arrow pointing to on the surface of the pathogen?

• a molecule called an antigen

• a molecule called an antibody

The diagram shows a lymphocyte. What is the arrow pointing to on the surface of the lymphocyte?

• molecules called antigens

• molecules called antibodies

What happens after the second time you are exposed to a pathogen?

• The body will not be able to fight off the pathogen quickly, because it knows how to get into the body easier.

• The body's immune system will react the same was as it did during the first exposure.

• The body can only be exposed to a pathogen a second time if you do not have a vaccine.

• The body will know how to fight off the pathogen quickly, because memory cells have been created after the first encounter.

How do T cells differ from B cells?

• T cells fight pathogens by killing pathogens directly, while B cells fight pathogens by making antibodies.

• T cells only make memory cells, and B cells only make antigens

• T cells fight pathogens by making antibodies, while B cells fight pathogens by killing pathogens directly.

• T cells can only fight off pathogens the body has encountered once, and B cells can fight off any pathogen the body comes across.

Which of the following statements is TRUE about someone's immune system that has allergies?

• Body cells are dividing at an uncontrolled rate.

• The body is reacting to foreign antigens that are not dangerous to most people.

• T cells and B cells in the body cannot be activated.

• The body is mistaking its own cells for foreign antigens.