Question

1.	Select the statements that correctly describe the role of the thymus, spleen, and lymph nodes in adaptive immunity. Select the TWO answers that are correct.
	The thymus is the site of T cell development. The thymus and lymph nodes work together in humoral immunity. The thymus and spleen produce B cells. Lymph nodes and the spleen filter pathogens from lymph and blood. The lymph nodes secrete lymphatic fluid.

2.

How do humoral immunity and cell-mediated immunity differ? Select the TWO answers that are correct.

Humoral immunity involves mainly B cells, whereas cell-mediated immunity involves mainly T cells. Humoral immunity is an innate immune response, whereas cell-mediated immunity is an adaptive immune response. Humoral immunity targets antigens that circulate in blood and lymph, whereas cell-mediated immunity targets abnormal cells. Humoral immunity involves mainly T cells, whereas cell-mediated immunity involves mainly B cells. Humoral immunity responds to viral infection, whereas cell-mediated immunity responds to bacterial infection.

3.	Select statements that correctly describe the functions of lymphocytes in cell-mediated immunity. Select the TWO statements that are correct.
	Phagocytes make many copies of a specific antibody. B cells recognize antigens and divide into plasma cells. Memory B cells retain antibodies to respond to future infections. Memory T cells enter circulation to recognize future infections. Cytotoxic T cells kill pathogens and abnormal body cells.

4.

Select statements that correctly describe interactions between antibodies and antigens. Select the TWO statements that are correct.

An antibody on the surface of a B cell recognizes and binds to a specific antigen on the surface of a pathogen. An antibody is an immune protein that circulates in body fluids that binds to an antigen on the surface of a pathogen. An antibody is a surface protein of a pathogen that is recognized by an antigen on a lymphocyte. An antibody is a lymphocyte that rapidly divides into plasma cells when it detects an antigen. An antibody is a complex and versatile protein that recognizes and binds to many different antigens.

5.	Select the statements that correctly describe the role of B and T cells. Select the TWO answers that are correct.
	B cells form the lymph nodes. T cells make up the thymus. B cells produce antibodies. T cells destroy infected cells. B cells stimulate T cells.

6.

What is a memory cell?

a lymphocyte that recognizes a specific antigen long after initial exposure to the pathogen a B cell that binds to antigens that are structurally different from the initial antigen a T cell that supplies B cells with antibodies that match an antigen from a previous infection a phagocyte that binds to a specific antigen and engulfs the cell with that antigen a plasma cell that releases large amounts of a specific antibody into the bloodstream

Answer 1

1.Correct answers are:

• The thymus is the site of T cell development.
• Lymph nodes and the spleen filter pathogens from lymph and blood.

2.Correct answers are

• Humoral immunity involves mainly B cells, whereas cell-mediated immunity involves mainly T cells.
• Humoral immunity targets antigens that circulate in blood and lymph, whereas cell-mediated immunity targets abnormal cells.

3.Correct answers are:

• Memory T cells enter circulation to recognize future infections.
• Cytotoxic T cells kill pathogens and abnormal body cells.

4.Correct answers are:

• An antibody on the surface of a B cell recognizes and binds to a specific antigen on the surface of a pathogen.
• An antibody is an immune protein that circulates in body fluids that binds to an antigen on the surface of a pathogen.

5.Correct answers are :

• B cells produce antibodies.
• T cells destroy infected cells.

6.Correct answer is:  a lymphocyte that recognizes a specific antigen long after initial exposure to the pathogen