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

a. Stimulation of macrophages

b. Activation of naïve T_C cells

c. Stimulation of naïve B cells

d. Stimulation of clonal selection

Explain how active immunity and passive immunity differ.

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

Each class of antibody is specifically defined by its

Which antibody class is abundant in body secretions?

a. IgA

b. IgD

c. IgE

d. IgG

e. IgM

The specificity of an antibody is determined by the

(a) Fixed segment

(b) Antigenic determinants

(c) Variable region

(d) Size of the antibody

(e) Antibody class