Antibodies:Question 19Select one:a.bind to antigens on the surface of pathogensb.are part of the first line of defence. c.are features on the outside of cells or pathogensd.are infections or diseases

What are antigens?Proteins found on the surface of cellsMicrobes that cause diseasesProteins that bind to pathogensProteins that kill toxins released by pathogens3Which of the following statements about antibodies is not true?They can cause pathogens to clump togetherA single antibody can destroy a wide range of pathogensThey attach to antigensThey are produced by white blood cells4

Which term refers to antibodies that target a specific pathogen or antigen?Polyvalent antibodiesMonoclonal antibodiesNarrow-spectrum antibodiesBroad-spectrum antibodies

Antigens:Question 22Select one or more:a. are used by the immune system to identify what is part of the body and what is a pathogen.b.are often large proteins (some carbohydrates and lipids can also be antigenic).c.stimulate the activity of T and B lymphocytes.d.are found on the surface of cells (both pathogens and body cells), and on pollen, toxins, and food.

Distinguish between antigens and antibodies and describe the roles of antibodies.

When antibodies bind to the antigens on a pathogen or toxin....Choose all correct answers.Question 17Select one or more:a.a toxin coated with antibodies cannot damage the cell.b.Antigens that are coated with antibodies are easier for phagocytes to attach toc.The pathogen can no longer attach to the target cell.d.Antibodies can link antigens together forming a cluster that phagocytes can ingest.