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.

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

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

What is an antigen?Multiple choice question.any molecule that triggers an immune responsea molecule produced during an immune response

n acquired immunity, lymphocyte provides a specific defense against pathogens. The body detects the foreign object or pathogen by certain molecules attached on the outside of invading pathogens or by other foreign objects.Select one:a.TRUEb.FALS

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