Micro McGraw Hill Chapter 15 Review

Specific immunity provides long-lasting protection through the production of _______.

• antibodies

• plasma cells

• T helper cells

• memory cells

• phagocytotic cells

Which lymphocytes lack specificity for antigen and attack cancer cells and virus-infected cells?

• Helper T cells

• Suppressor T cells

• Cytotoxic T cells

• Delayed hypersensitivity T cells

• Natural killer (NK) cells

Human B lymphocytes mature in an intestinal region called the bursa.

• True

• False

Acquired specific immunity involves the response of _______.

• skin barriers

• B and T lymphocytes

• lysozyme

• mucus membranes

• interferon

Helper T cells _______.

• secrete antibodies

• function in allergic reactions

• directly destroy target cells

• suppress immune reactions

• activate B cells and other T cells

Lymphocyte maturation involves _______.

• hormonal signals that initiate development

• B cells maturing in bone marrow sites

• T cells maturing in the thymus

• release of mature lymphocytes to begin migration to various lymphoid organs

• All of these choices are correct.

The molecular fragment on an antigen molecule that a lymphocyte recognizes and responds to is called a/an _______.

• epitope

• hapten

• antigen binding site

• variable region

Small foreign molecules that are too small by themselves to elicit an immune response are termed ________.

• epitope

• hapten

• antigen binding site

• variable region

Superantigens are _______.

• body tissues that the immune system mistakes as foreign

• cell markers found in some member of a species but not in other members

• bacterial toxins that activate T cells at a 100 times greater rate than other antigens

• antigens that evoke allergic reactions

Antigens that elicit allergic reactions are called _______.

• superantigens

• heterophilic antigens

• allergens

• autoantigens