chapter 19 TRUE AND FALSE Flashcards

1) Individuals who do not express CCR5 are highly resistant to
infection by HIV.

TRUE

2) Vaccines against HIV have proven to be very effective in halting
the spread of disease.

FALSE

3) All hypersensitivities involve antibody-antigen reactions.

FALSE

4) Skin tests are reliable indicators for the diagnosis of
food-related allergies.

FALSE

5) HIV attack of CD4+ T cells causes suppression of both
cell-mediated and humoral immune responses.

TRUE

6) Autoimmune diseases occur when the immune system is unable to
discriminate self from nonself.

TRUE

7) Xenotransplantation is an effective alternative to using isografts.

FALSE

8) All stem cells are derived from embryonic stem cells.

FALSE

9) Cancer is similar to an infectious disease in that it is due to a
failure of the bodys defenses.

TRUE

10) HIV is believed to have arisen by mutation of a virus endemic to
wild animals in Africa.

TRUE

11) A hypersensitivity reaction refers to immune responses to
antigens beyond what would be normal.

TRUE