Which of the following statements regarding major histocompatibility proteins (MHCs) is TRUE?
A. Class I MHCs are found on all cells of the body except erythrocytes.
B. Class II MHCs are normally found in the cell membranes of bacteria.
C. Cytotoxic T cells require class II MHCs to recognize foreign antigens.
D. All humans have identical sets of MHC proteins.
E. MHC proteins are the same thing as antibodies.
A
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Which is NOT true about AIDS?
A. The HIV virus preferentially enters and disables B cells. B. It is caused by a virus that contains RNA. C. It is caused by a retrovirus. D. It is transmitted by intimate contact with infected blood, sexual intercourse with an infected partner, or by an infected mother to her breast-fed infant. E. Certain unusual cancers such as Kaposi's sarcoma co-occur with relatively high frequency.
The process by which antibodies bind to antigenic sites on viruses or toxins, rendering them incapable of binding to other cells, is called
A) opsonization. B) activation. C) agglutination. D) precipitation. E) neutralization.
Megakaryocytes are specialized cells of the bone marrow responsible for __________.
a. engulfing invading bacteria b. specific immune responses c. formation of platelets d. production of scar tissue in an injured area
All of the following are human organ systems except ________
A) lymphatic B) skeletal C) endocrine D) reproductive E) epidermal