6. During the lag period between antigen contact and detection of adaptive immunity,

A. antigen is hidden from the immune system in macrophages
B. innate immune effectors are eliminating antigen
C. innate immunity blocks the activation of adaptive immune effector cells
D. new B and T cells with the appropriate antigen specificity must be produced in the bone marrow

7. Lymphocytes are activated by antigen in the

A. blood stream
B. bone marrow
C. liver
D. lymph nodes

8. A pathogen can be a (n)

A. agent that causes a disease
B. virus
C. bacteria
D. All of these

9. CD antigens

A. allow leukocytes to recognize antigen
B. are each expressed on only one cell type
C. are expressed on immune cells to mark them for separation
D. function as receptors for cytokine and CAMs

10. A virus vaccine that can activate cytotoxic T cells must contain

A. a high dose of virus particles
B. an adjuvant to stimulate T cell division
C. live virus
D. virus peptides