21. The Immune System

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

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

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

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

_______ is the immunoglobulin class that neutralizes viruses in the intestinal tract.

Which antibody class crosses the placenta from mother to child?

Give one example of each type of immunity: innate immunity, naturally acquired active immunity, artificially acquired active immunity, artificially acquired passive immunity, and naturally acquired passive immunity.

Cells that can directly attack target cells include all of the following except:

a. Macrophages

b. Cytotoxic T cells

c. Helper T cells

d. Natural killer cells