The major histocompatibility complex (MHC) (a) is responsible for forming lymphocytes, (b) produces antibodies in lymph glands, (c) is a group of genes that codes for human leukocyte antigens, (d) is a membrane protein that can recognize foreign antigens, (e) is the antigen found on bacteria that stimulates an immune response.

Which of the following is not a role of TH cells?

a. Stimulation of macrophages

b. Activation of naïve TC cells

c. Stimulation of naïve B cells

d. Stimulation of clonal selection

Explain how active immunity and passive immunity differ.

Mark the following statements as true or false. If a statement is false, correct is to make a true statement.

c. Subunit vaccines consist of pathogens that are alive but unable to cause disease.

Which of the following antibodies is involved in causing basophils to release histamine when the antibody encounters an allergen?

Each class of antibody is specifically defined by its